WO2023246170A1 - 一种基于直播旱管种植减少稻田甲烷排放的方法及其应用 - Google Patents

一种基于直播旱管种植减少稻田甲烷排放的方法及其应用 Download PDF

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WO2023246170A1
WO2023246170A1 PCT/CN2023/079747 CN2023079747W WO2023246170A1 WO 2023246170 A1 WO2023246170 A1 WO 2023246170A1 CN 2023079747 W CN2023079747 W CN 2023079747W WO 2023246170 A1 WO2023246170 A1 WO 2023246170A1
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rice
soil
direct seeding
moisture content
drought
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PCT/CN2023/079747
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English (en)
French (fr)
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周胜
罗利军
张鲜鲜
毕俊国
孙会峰
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上海市农业科学院
上海市农业生物基因中心
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Publication of WO2023246170A1 publication Critical patent/WO2023246170A1/zh

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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G22/00—Cultivation of specific crops or plants not otherwise provided for
    • A01G22/20—Cereals
    • A01G22/22—Rice
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G25/00—Watering gardens, fields, sports grounds or the like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
    • Y02P60/22—Methane [CH4], e.g. from rice paddies

Definitions

  • the invention belongs to the technical field of agricultural emission reduction, and specifically relates to a method and its application for reducing methane emissions in rice fields based on direct-seeded dry tube planting.
  • Agricultural activities are an important source of methane emissions, mainly including rice production in the planting industry and ruminant enteric fermentation in the breeding industry.
  • my country's rice sown area is 450 million acres (China Agricultural Statistical Yearbook, 2018), accounting for approximately 20% of the world's rice sown area and 28% of my country's total grain sown area.
  • Due to the habitual flooding management during rice planting methane emissions from rice fields remain high every year.
  • the annual methane emissions from rice cultivation are 8.911 million tons (equivalent to 187 million tons of carbon dioxide equivalent), accounting for 22.6% of carbon emissions from agricultural activities. Therefore, reducing methane emissions from rice fields is crucial for my country's agricultural production to achieve green and low-carbon transformation.
  • the purpose of the present invention is to provide a method and its application for reducing methane emissions in rice fields based on direct-seeding upland tube planting, making full use of cultivated rice germplasm resources with strong drought resistance, and through direct-seeding upland tube planting.
  • the technology controls the relative volumetric moisture content of rice field soil at a low level and increases the soil redox potential. It is simple and easy to implement and can significantly reduce the production and emission of methane in rice fields without affecting rice yield.
  • the invention provides a method for reducing methane emissions in rice fields based on direct seeding and upland tube planting. Drought-resistant cultivated rice varieties are sown in a direct seeding manner, and dry tube planting is performed after emergence: rainwater is mainly used throughout the growth period, and there is no water layer in the field; During the water shortage sensitive period, when the soil volume moisture content is ⁇ 35%, irrigate until the soil volume moisture content is ⁇ 50%.
  • the full growth period refers to the entire growth period of rice, including the seedling stage, tillering stage, jointing stage, booting stage, heading and flowering stage, grain filling stage and maturity stage.
  • the anhydrous layer in the field refers to the absence of surface water in the rice fields.
  • the average soil volume moisture content during the entire growth period is ⁇ 45%;
  • the average soil volume moisture content during the entire growth period of rice is obtained by averaging the soil volume moisture content measured daily during the entire growth period of rice.
  • the soil volume moisture content measured daily is averaged by the soil volume moisture content measured multiple times on the same day.
  • the result is obtained by averaging the soil volume moisture content measured by the soil moisture sensor according to the measurement frequency of once every half hour.
  • the volume moisture content of rice field soil ranges from 20 to 55% (average soil volume moisture content ⁇ 45%), which significantly reduces the time that rice field soil is in a reducing state, inhibits methane generation, promotes methane oxidation, and thus significantly reduces methane emissions.
  • the soil volume moisture content is measured based on a soil moisture sensor, and the soil volume moisture content is measured at a burial depth of 5 to 10 cm in the paddy field soil.
  • the irrigation is horse water irrigation.
  • Baoma water irrigation means that there is no water storage operation in the field during irrigation, and there is no aquifer in the field after irrigation.
  • the water shortage sensitive periods are tillering stage, booting stage, heading and flowering stage and grain filling stage.
  • the drought resistance level of the drought-resistant cultivated rice varieties is level 2 to level 4.
  • Selection of drought-resistant cultivated rice varieties Select new cultivated rice varieties that have both the drought-resistant characteristics of upland rice and the characteristics of high yield and high quality.
  • the drought-resistant ability is evaluated according to the "Technical Specifications for Identification of Drought Resistance of Water-Saving and Drought-Resistant Rice" (NY/T 2863-2015)
  • the drought resistance level is 2 to 4, which is suitable for water direct seeding or drought direct seeding.
  • the drought-resistant cultivated rice varieties are suitable for planting under the climatic conditions of the planting area.
  • the method of sowing is selected from at least one of artificial drill sowing, artificial hole sowing, artificial broadcasting, mechanical drill sowing, mechanical hole sowing and mechanical broadcasting;
  • the said live broadcast is water live broadcast or dry live broadcast
  • feature b2) also includes at least one of the following technical features:
  • the water direct seeding is to sow the seeds of drought-resistant cultivated rice varieties that have been germinated to white in paddy soil with a soil volume moisture content of 50-55%, and check and replenish the seedlings 20-25 days after sowing. Drain or naturally dry the water layer in the paddy field after the leaves reach the first heart stage;
  • the dry direct seeding is to sow the seeds of drought-resistant cultivated rice varieties in the soil of paddy fields, wait for germination and emergence, and check and replenish the seedlings 20 to 25 days after emergence.
  • a second aspect of the present invention provides the application of the above method for reducing methane emissions in rice fields based on direct seeding and upland tube planting in rice planting.
  • the invention provides a method and its application for reducing methane emissions from rice fields based on direct-seeded dry tube planting. It can not only significantly reduce methane emissions from rice fields, but also save irrigation water in rice fields, improve fertilizer utilization, and at the same time reduce excessive irrigation and fertilization. Caused loss of nitrogen and phosphorus nutrients.
  • Figure 1 is a comparison chart of the average soil volumetric moisture content between the direct-seeded water pipe in Example 1 and the flooded irrigation water management model in Control 1.
  • Figure 2 is a comparison chart of methane emissions between the direct-pipeline irrigation system in Example 1 and the flooded irrigation water management model in Control 1.
  • Figure 3 is a comparison chart of yields between the direct-seeded water management model of Example 1 and the flooded irrigation water management model of Control 1.
  • Figure 4 is a comparison chart of the average soil volumetric moisture content between the direct-seeded water pipe in Example 2 and the flooded irrigation water management model in Control 2.
  • Figure 5 is a comparison chart of methane emissions between the direct-pipeline irrigation system in Example 2 and the flooded irrigation water management model in Control 2.
  • Figure 6 is a comparison chart of yields between the direct-seeded water management model of Example 2 and the flooded irrigation water management model of Control 2.
  • Example 1 Directly seeded water pipes reduce methane emissions from rice fields
  • the water layer in the rice field is drained or naturally sun-dried after the three leaves of the rice are aligned, until there is no water layer on the field surface during the rice harvest period.
  • the soil volumetric moisture content during the entire growth period is monitored and recorded in real time using a soil temperature and humidity recorder (TMS-4) installed in the rice field soil.
  • TMS-4 soil temperature and humidity recorder
  • the measurement position of the soil volumetric moisture content is 5 to 10cm deep in the rice field soil; rice field methane
  • the daily changes in emission flux were monitored using the static box-gas chromatography method, and the daily methane emissions during the rice season were accumulated to calculate the total emissions.
  • Example 2 Dry direct seeding and dry management to reduce methane emissions from rice fields
  • Irrigation should be combined with field fertilization and pest and disease control.
  • field fertilization and pest and disease control During the sensitive periods of water shortage (tillering stage, booting stage, heading and flowering stage and grain filling stage), when the soil volume moisture content is ⁇ 35%, irrigate until the soil volume moisture content is ⁇ 50%.
  • the soil volumetric moisture content during the entire growth period is monitored and recorded in real time using a soil temperature and humidity recorder (TMS-4) installed in the rice field soil.
  • TMS-4 soil temperature and humidity recorder
  • the measurement position of the soil volumetric moisture content is 5 to 10cm deep in the rice field soil; rice field methane
  • the daily changes in emission flux were monitored using the static box-gas chromatography method, and the daily methane emissions during the rice season were accumulated to calculate the total emissions.
  • the technology of the present invention is used to reduce methane emissions from rice production.
  • Example 1 Screen Hanyou 73 as test material; Plant for 24 hours, germination for 24 hours, wait until the rice seeds turn white and then dry; drain the water in the field after soaking the field for 1 week; sow the soaked rice seeds into a flat, cultivated field without a water layer.
  • the soil volume moisture content It is 50-52%; from sowing to 20-25 days after sowing (three leaves and one heart stage), the soil surface is moist but there is no water layer; around the 25th day, the water layer in the rice field is drained or naturally dried, and there is no water on the field surface during the rice harvest.
  • Control 1 flooded irrigation water management mode: Screen the common rice variety Hyou 518 as the control material; Sow for 24 hours, germination for 24 hours, wait until the rice seeds turn white and then dry; drain the water in the field after soaking for 1 week; sow the soaked rice seeds directly into the cultivated fields with no water layer; sow until after sowing On days 20 to 25 (three leaves and one heart stage), the soil surface should be moist but without water accumulation; flood irrigation should begin on the 25th day, and the water layer in the field should be maintained at 10 cm until it dries out one month before the rice harvest.
  • Example 1 The average soil volume moisture content during the entire growth period of Example 1 was 43%, 17% lower than that of Control 1 (flooded irrigation water management mode), see Figure 1;
  • a static box-gas chromatography method was used to monitor rice field methane emissions. Flux changes and total emissions were calculated.
  • the methane emissions of Example 1 were reduced by 72% compared to Control 1 (flooded irrigation water management mode), see Figure 2. After harvesting, the yield was measured. The yield of Example 1 was compared with Control 1 (flooded irrigation water management mode). management mode), see Figure 3.
  • Example 2 Screen Hanyou 73 as the test material; sow the dry seeds in flat rice field soil and wait for rain to germinate and emerge. If there is no rain, irrigate until the soil volume moisture content is 48-50%; There is no aquifer in the field during the entire growth period of rice; during the sensitive periods of water shortage (tillering stage, booting stage, heading and flowering stage and grain filling stage), when the soil volume moisture content is ⁇ 35%, irrigate until the soil volume moisture content is 53-55% , and there is no water layer in the field.
  • Control 2 (flooded irrigation water management mode): Select the common rice variety Huanghuazhan as the control test material; maintain the field water layer at 10cm after soaking the field for 1 week; transplant the seedlings into a flat field with a 10cm field water layer. Medium; maintain the field water layer at 10cm during the rice growth period until it dries up one month before the rice harvest.
  • Example 2 The average soil volume moisture content during the entire growth period of Example 2 was 38%, which was 27% lower than Control 2 (flooded irrigation water management mode), as shown in Figure 4; the static box-gas chromatography method was used to monitor rice field methane emissions during the entire growth period of Example 2. Flux changes and total emissions were calculated. The methane emissions of Example 2 were reduced by 91% compared to Control 2 (flooded irrigation water management mode), see Figure 5. After harvesting, the yield was measured. The yield of Example 2 was compared with Control 2 (flooded irrigation water management mode). management mode), see Figure 6.

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Abstract

一种基于直播旱管种植减少稻田甲烷排放的方法。该方法将抗旱栽培稻品种以直播方式进行播种，出苗后进行旱管种植：全生育期利用雨水为主，田间无水层；在缺水敏感期，当土壤体积含水率≤35％时，灌溉至土壤体积含水率≥50％。该方法在保证稻谷产量的前提下，大幅降低稻田甲烷的排放。还包括一种该方法在水稻种植上的应用。

Description

一种基于直播旱管种植减少稻田甲烷排放的方法及其应用 技术领域
本发明属于农业减排技术领域，具体涉及一种基于直播旱管种植减少稻田甲烷排放的方法及其应用。
背景技术
碳排放引发的全球气候变化已经给人类社会与经济发展带来了显著影响，并成为国际社会普遍关注的重大问题。甲烷是仅次于二氧化碳的强效温室气体，造成的温室效应约占全球碳排放的15％。2021年IPCC颁布的第六次评估报告《气候变化2021：自然科学基础》首次强调了甲烷减排对控制全球升温的重要性；中美两国在联合国气候变化格拉斯哥大会期间发布的《中美关于在21世纪20年代强化气候行动的格拉斯哥联合宣言》也特别提到减少甲烷排放是21世纪20年代的必要事项。农业活动是重要的甲烷排放源，主要包括种植业的水稻生产与养殖业的反刍动物肠道发酵等。其中，我国水稻播种面积4.5亿亩(中国农业统计年鉴，2018)，约占世界水稻播种面积的20％，占我国粮食播种总面积的28％。由于水稻种植过程中习惯性淹灌管理，造成每年稻田甲烷排放量居高不下。每年因水稻种植排放的甲烷为891.1万吨(相当于1.87亿吨二氧化碳当量)，占农业活动碳排放量的22.6％。因此，减少稻田甲烷排放对于我国农业生产实现绿色低碳转型至关重要。
稻田土壤在淹水状况下的极端厌氧环境是产生甲烷的重要条件。研究表明，通过多次烤田排水、间歇灌溉、薄层灌溉等节水措施减少稻田灌溉水量，降低土壤水分饱和度，可以抑制土壤中产甲烷菌生成甲烷，同时促进甲烷氧化，达到降低甲烷排放的目的。但是降低土壤水分饱和度与水稻旺盛的需水特性之间相互制约。例如日本研发出延长烤田时间(PMD)减排技术，并制定了《抑制稻田甲烷排放的新式水分管理技术手册》(2012)进行推广，然而该技术由于缺乏能在较长干旱环境下正常生长的水稻品种，因此延长烤田时间有限，水稻生育期的大部分时间仍以保留淹水层为主，甲烷减排与水稻产量难以兼顾；近年来推广的干湿交替灌溉(AWD)减排甲烷技术，取得了一定的示范效果，但该方法需要根据田间水位经常进行灌溉管理，不仅增加了农民的管理与劳动力成本，而且由于降雨的影响，甲烷减排效果波动较大。
因此，如何提供一种既能保证产量、操作又简便的稻田甲烷减排技术对于农业领域实现低碳转型至关重要。
发明内容
鉴于以上所述现有技术的缺点，本发明的目的在于提供一种基于直播旱管种植减少稻田甲烷排放的方法及其应用，充分利用抗旱能力强的栽培稻种质资源，通过直播旱管种植技术控制稻田土壤相对体积含水率处于较低水平，提升土壤氧化还原电位，简便易行，可在不影响稻谷产量的前提下，大幅度降低稻田甲烷的产生和排放。
本发明提供的一种基于直播旱管种植减少稻田甲烷排放的方法，将抗旱栽培稻品种以直播方式进行播种，出苗后进行旱管种植：全生育期利用雨水为主，田间无水层；在缺水敏感期，当土壤体积含水率≤35％时，灌溉至土壤体积含水率≥50％。
全生育期为水稻整个生育期，包括出苗期、分蘖期、拔节期、孕穗期、抽穗开花期、灌浆期和成熟期。田间无水层是指稻田无田面水。
优选地，全生育期的平均土壤体积含水率≤45％；
全生育期的平均土壤体积含水率为水稻整个生育期内每日测量获得的土壤体积含水率进行平均所得，每日测量获得的土壤体积含水率为当天多次测量获得的土壤体积含水率进行平均所得，如按照测量频次为每半个小时一次通过土壤湿度传感器测量获得土壤体积含水率进行平均所得。
和/或，在缺水敏感期，当土壤体积含水率≤35％时，灌溉至土壤体积含水率为50～55％，如50～52％、52～53％或53～55％。
旱管期间稻田土壤体积含水率范围为20～55％(平均土壤体积含水率≤45％)，显著减少稻田土壤处于还原状态的时间，抑制甲烷生成，促进甲烷氧化，进而大幅减少甲烷排放。
进一步，所述土壤体积含水率是基于土壤湿度传感器测量所得，所述土壤体积含水率的测量位置为稻田土壤埋深5～10cm。
优选地，所述灌溉为跑马水灌溉。跑马水灌溉是指灌溉时田间不进行蓄水操作，且灌溉后田间无水层。
更优选地，所述缺水敏感期为分蘖期、孕穗期、抽穗开花期和灌浆期。
优选地，还包括如下技术特征中的至少一项：
a1)所述抗旱栽培稻品种的抗旱级别为2～4级。抗旱栽培稻品种的选择：选择既具有旱稻的抗旱特性、又有水稻高产优质特性的新型栽培稻品种，抗旱能力根据《节水抗旱稻抗旱性鉴定技术规范》(NY/T 2863-2015)鉴定的抗旱级别为2～4级，适用于水直播或旱直播。
a2)所述抗旱栽培稻品种适合在种植区气候条件下种植。
优选地，还包括如下技术特征中的至少一项：
b1)播种的方式选自人工条播、人工穴播、人工撒播、机械条播、机械穴播和机械撒播中的至少一种；
b2)所述直播为水直播或旱直播；
b3)播种后覆盖厚度为2～3cm的土壤。
更优选地，特征b2)中，还包括如下技术特征中的至少一项：
b21)所述水直播是将已催芽至露白的抗旱栽培稻品种的种子播于土壤体积含水率为50～55％的稻田土壤中，并在播种后20～25天进行查苗补苗，于三叶一心期后排干或自然晒干稻田水层；
b22)所述旱直播是将抗旱栽培稻品种的种子播于稻田土壤中，等待萌发及出苗，在出苗后20～25天进行查苗补苗。
进一步更优选地，特征b22)中，等待萌发及出苗期间，若无雨水，则进行灌溉，灌溉至土壤体积含水率为45～50％。
本发明第二方面提供上述基于直播旱管种植减少稻田甲烷排放的方法，在水稻种植上的应用。
本发明提供了一种基于直播旱管种植减少稻田甲烷排放的方法及其应用，不仅能大幅度降低稻田甲烷排放外，还能节约稻田灌溉用水、提高肥料利用率，同时减少由于过量灌溉与施肥引起的氮磷养分流失。
附图说明
图1为实例1的水直播旱管与对照1的淹灌水分管理模式的平均土壤体积含水率对比图。
图2为实例1的水直播旱管与对照1的淹灌水分管理模式的甲烷排放对比图。
图3为实例1的水直播旱管与对照1的淹灌水分管理模式的产量对比图。
图4为实例2的水直播旱管与对照2的淹灌水分管理模式的平均土壤体积含水率对比图。
图5为实例2的水直播旱管与对照2的淹灌水分管理模式的甲烷排放对比图。
图6为实例2的水直播旱管与对照2的淹灌水分管理模式的产量对比图。
具体实施方式
下面结合实施例进一步阐述本发明。应理解，这些实施例仅用于说明本发明，而非限制本发明的范围。下列实施例中未注明具体条件的实验方法及未说明配方的试剂均为按照常规条件或者制造商建议的条件进行或配置。
实施例1：水直播旱管减少稻田甲烷排放
a.依据《节水抗旱稻抗旱性鉴定技术规范》(NY/T 2863-2015)筛选抗旱性级别为2级的节水抗旱稻品种——旱优73，该品种由上海市农业生物基因中心与上海天谷生物科技股份有限公司共同选育的三系籼型杂交节水抗旱稻。旱优73在江淮流域广泛种植，全生育期123天左右。
b.将已催芽至露白的稻种直接播于耕耘平整，无水层的田块(土壤体积含水率为50～55％)中。在播种后20～25天时及时查苗补苗，构建适宜群体。
c.水直播稻田在水稻三叶一心后排干或自然晒干稻田水层，至水稻收获期间田面无水层。
d.灌溉结合田间施肥、病虫害防治进行，生长期田间无水层。在缺水敏感期(分蘖期、孕穗期、抽穗开花期和灌浆期)，当土壤体积含水率≤35％时，灌溉至土壤体积含水率≥50％。
e.全生育期的土壤体积含水率利用设置在稻田土壤中的土壤温湿度记录仪(TMS-4)进行实时监测记录，土壤体积含水率的测量位置为稻田土壤埋深5～10cm；稻田甲烷排放通量日变化利用静态箱-气相色谱法监测，并将稻季甲烷日排放量进行累加计算总排放量。
实施例2：旱直播旱管减少稻田甲烷排放
a.依据《节水抗旱稻抗旱性鉴定技术规范》(NY/T 2863-2015)筛选抗旱性级别为2级的节水抗旱稻品种——旱优73，该品种由上海市农业生物基因中心与上海天谷生物科技股份有限公司共同选育的三系籼型杂交节水抗旱稻。旱优73在江淮流域广泛种植，全生育期123天左右。
b.将干种子直接播于翻耕整平的稻田土壤中，等待萌发及出苗，若无雨水，则进行灌溉，灌溉至土壤体积含水率为45～50％。在出苗后20～25天时及时查苗补苗，构建适宜群体。
c.旱直播旱管稻田在水稻全生育期田间无水层。
d.灌溉应结合田间施肥、病虫害防治进行。在缺水敏感期(分蘖期、孕穗期、抽穗开花期和灌浆期)，当土壤体积含水率≤35％时，灌溉至土壤体积含水率≥50％。
e.全生育期的土壤体积含水率利用设置在稻田土壤中的土壤温湿度记录仪(TMS-4)进行实时监测记录，土壤体积含水率的测量位置为稻田土壤埋深5～10cm；稻田甲烷排放通量日变化利用静态箱-气相色谱法监测，并将稻季甲烷日排放量进行累加计算总排放量。
本发明的应用实例：
将本发明技术用于水稻生产减排甲烷上。
1、实例1：筛选旱优73为试材；种24h，催芽24h，待稻种露白后晾干；泡田1周后排干田块中积水；将已浸种的稻种直播于耕耘平整、无水层的田块中，土壤体积含水率为50～52％；播种至播种后20～25天(三叶一心期)土壤表面湿润但无水层；在第25天左右时排干或自然晒干稻田水层，水稻收获期间田面无水层；在缺水敏感期(分蘖期、孕穗期、抽穗开花期和灌浆期)，当土壤体积含水率≤35％时，灌溉至土壤体积含水率为50～52％，且田间无水层。
2、对照1(淹灌水分管理模式)：筛选普通水稻品种H优518作为对照试材；种24h，催芽24h，待稻种露白后晾干；泡田1周后排干田块中积水；将已浸种的稻种直播于耕耘平整、无水层的田块中；播种至播种后20～25天(三叶一心期)土壤表面湿润但无积水；从第25天开始淹水灌溉，并维持田间水层10cm，直至水稻收获前一月落干。
实例1的全生育期平均土壤体积含水率为43％，比对照1(淹灌水分管理模式)降低17％，见图1；实例1的全生育期利用静态箱-气相色谱法监测稻田甲烷排放通量变化，并计算总排放量，实例1的甲烷排放量对比对照1(淹灌水分管理模式)减少72％，见图2；收获后测产，实例1的产量对比对照1(淹灌水分管理模式)无显著差异，见图3。
3、实例2：筛选旱优73为试材；将干种直播于平整的稻田土壤中，等待雨水萌发及出苗，若无雨水，则进行灌溉，灌溉至土壤体积含水率为48～50％；水稻全生育期田间无水层；在缺水敏感期(分蘖期、孕穗期、抽穗开花期和灌浆期)，当土壤体积含水率≤35％时，灌溉至土壤体积含水率为53～55％，且田间无水层。
4、对照2(淹灌水分管理模式)：筛选普通水稻品种黄华占作为对照试材；泡田1周后维持田间水层10cm；以插秧方式将秧苗种于耕耘平整、田间水层10cm的田块中；稻季生育期维持田间水层10cm，直至水稻收获前一月落干。
实例2的全生育期平均土壤体积含水率为38％，比对照2(淹灌水分管理模式)降低27％，见图4；实例2的全生育期利用静态箱-气相色谱法监测稻田甲烷排放通量变化，并计算总排放量，实例2的甲烷排放量对比对照2(淹灌水分管理模式)减少91％，见图5；收获后测产，实例2的产量对比对照2(淹灌水分管理模式)无显著差异，见图6。
以上的实施例是为了说明本发明公开的实施方案，并不能理解为对本发明的限制。此外，本文所列出的各种修改以及发明中方法、抗旱品种的变化，在不脱离本发明的范围和精神的前提下对本领域内的技术人员来说是显而易见的。虽然已结合本发明的多种具体优选实施例对本发明进行了具体的描述，但应当理解，本发明不应仅限于这些具体实施例。事实上，各 种如上所述的对本领域内的技术人员来说显而易见的修改来获取发明都应包括在本发明的范围内。

Claims (10)

  1. 一种基于直播旱管种植减少稻田甲烷排放的方法，其特征在于，将抗旱栽培稻品种以直播方式进行播种，出苗后进行旱管种植：全生育期利用雨水为主，田间无水层；在缺水敏感期，当土壤体积含水率≤35％时，灌溉至土壤体积含水率≥50％。
  2. 如权利要求1所述的基于直播旱管种植减少稻田甲烷排放的方法，其特征在于，全生育期的平均土壤体积含水率≤45％；
    和/或，在缺水敏感期，当土壤体积含水率≤35％时，灌溉至土壤体积含水率为50～55％。
  3. 如权利要求1所述的基于直播旱管种植减少稻田甲烷排放的方法，其特征在于，所述土壤体积含水率是基于土壤湿度传感器测量所得，所述土壤体积含水率的测量位置为稻田土壤埋深5～10cm。
  4. 如权利要求1所述的基于直播旱管种植减少稻田甲烷排放的方法，其特征在于，所述灌溉为跑马水灌溉。
  5. 如权利要求1所述的基于直播旱管种植减少稻田甲烷排放的方法，其特征在于，所述缺水敏感期为分蘖期、孕穗期、抽穗开花期和灌浆期。
  6. 如权利要求1所述的基于直播旱管种植减少稻田甲烷排放的方法，其特征在于，还包括如下技术特征中的至少一项：
    a1)所述抗旱栽培稻品种的抗旱级别为2～4级；
    a2)所述抗旱栽培稻品种适合在种植区气候条件下种植。
  7. 如权利要求1所述的基于直播旱管种植减少稻田甲烷排放的方法，其特征在于，还包括如下技术特征中的至少一项：
    b1)播种的方式选自人工条播、人工穴播、人工撒播、机械条播、机械穴播和机械撒播中的至少一种；
    b2)所述直播为水直播或旱直播；
    b3)播种后覆盖厚度为2～3cm的土壤。
  8. 如权利要求7所述的基于直播旱管种植减少稻田甲烷排放的方法，其特征在于，特征b2)中，还包括如下技术特征中的至少一项：
    b21)所述水直播是将已催芽至露白的抗旱栽培稻品种的种子播于土壤体积含水率为50～55％的稻田土壤中，并在播种后20～25天进行查苗补苗，于三叶一心期后排干或自然晒干稻田水层；
    b22)所述旱直播是将抗旱栽培稻品种的种子播于稻田土壤中，等待萌发及出苗，在出苗后20～25天进行查苗补苗。
  9. 如权利要求8所述的基于直播旱管种植减少稻田甲烷排放的方法，其特征在于，特征b22)中，等待萌发及出苗期间，若无雨水，则进行灌溉，灌溉至土壤体积含水率为45～50％。
  10. 如权利要求1至9任一项所述的基于直播旱管种植减少稻田甲烷排放的方法，在水稻种植上的应用。
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