CN112182829A - 中国30种乔木树种极限生长预测预报方法 - Google Patents
中国30种乔木树种极限生长预测预报方法 Download PDFInfo
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Abstract
本发明公开了一种中国30种乔木树种极限生长预测预报方法。该发明是通过中国30种乔木树种解析木生长量数据,将乔木生长过程进行模拟,将每个树种生长过程划分为生长缓慢期、生长旺盛期、生长趋于停止期三个阶段,建立在所有立地条件达到最优状态下植被能够生长到的最优状态的中国30种乔木树种胸径、树高的极限生长模型。通过这些模型即可在已知乔木树种和年龄的情况下可以快速预测该乔木的胸径和树高值,克服了每木检尺适用范围小、低效率的难题,大大减少了人为外业工作量,提高了工作效率。
Description
一、技术领域
本发明涉及一种中国乔木树种生长预测预报方法,特别是一种中国30种乔木树种极限生长预测预报方法。
二、技术背景
树高和胸径是森林资源调查中的重要因子,常用于预测林分生产力和树木材积。到目前为止,测定树木生长量的方法主要采用连年的每木检尺法来确定连年生长的胸径和树高,但在实际测定过程中采用每木检尺法进行乔木胸径和树高的测定仅适合于小范围的精测,对于大范围的林分调查需要的工作量太大,且效率很低,所以在乔木树种生长量的测定过程中,采用每木检尺法来进行观测都存在明显的缺点和误差。因此利用模型计算森林生长量是十分有必要的。
此外,中国在森林资源的管理上还不具有整体性和完整性,这也导致中国森林资源的调查依然面临着一些现实性问题。有关森林乔木的生长模型,没有得到广泛的应用,并且与国外的计算模式相比还存在一定差距,这些差距不仅体现在森林资源动态更新的系统建立上,还体现在数据更新的技术上,因此,这就导致中国的森林资源动态数据更新不及时。显而易见,无论是五年一次的一类调查数据,还是十年一次的二类调查数据,都无法全面掌握中国的森林资源现状及动态变化情况,因此,迫切需要建立一种中国主要树种的乔木生长模型来反映中国的森林资源现状及动态变化情况。
三、发明内容
为了克服在各个树种生长量在实际中难以测定且误差较大,并为预测未来产量和探索管理方案来提供可靠依据,本发明提出了一种针对性强、效率高、易于推广应用的中国30种乔木树种(白桦、白皮松、白扦、白杨、白榆、侧柏、臭椿、粗叶云杉、法式冷杉、红桦、槲栎、槲树、华北落叶松、黄山松、冷杉、丽江云杉、辽东栎、落叶松、马尾松、青杨、杉木、栓皮栎、铁杉、兴安落叶松、油松、云南松、云杉、长包冷杉、中国槐、紫果云杉)极限生长预测预报方法,该模型是在所有立地条件达到最优状态下植被能够生长到的最优状态的模型。
本发明的目的是这样实现的:
①采用非线性最小二乘回归法,根据树木生长在不同阶段的生长速度不同的理论,对前人模型理论研究与大量解析木数据分析相结合,提出“双变点三速度”的概念。根据全国解析木生长量数据,将年龄最大树木作为标准木,以材积为自变量,通过聚类分析将每个树种生长过程划分为生长缓慢期、生长旺盛期、生长趋于停止期三个阶段。得到30个乔木树种的T1,T2,T3三个生长阶段。
②从地理空间、土壤状态、气象气候、水文地质、遥感NDVI、绿度、纹理信息等系统科学因子引入,建立非标准木(树高、胸径)模型。在进行某树种乔木的生长预测时,根据年龄确定乔木所处的生长阶段,当t在T1阶段时, 当t在T2阶段时,当t在T3阶段时,其中t为树木的年龄,a1,a2,a3,a4,a5,b1,b2,b3,b4为树木模型的参数,d1.3为树木的胸径或树高。实验数据分析表明树木生长特征主要与其生长年龄息息相关,显著性十分明显,地理环境因素对其生长有一定影响,地形地势环境因素好的地区树木生长状况较为良好,环境差异大的地区树木生长状况差异明显,且符合经验预期效果。
本发明具有以下优点:
(1)利用乔木树种极限生长模型,已知乔木树种和年龄的情况下可以快速预测该乔木的胸径和树高值,减少了大量的人为工作量,提高了工作效率。
(2)将中国30种乔木树种分为三个生长阶段,并建立30种乔木树种的极限生长模型,涵盖了中国绝大部分乔木树种,通过一个模型的不同参数即可获取某树种的胸径和树高,具有良好的应用和推广性。
四、具体实施方式
确定中国30中乔木树种生长量的过程与之前的测定方法相比,做了较大的改进,具体实施过程是:
1)已知乔木树种,采用树木年轮无损观测方法获取乔木本年度的年龄t,确定该乔木所处的生长阶段(生长缓慢期、生长旺盛期、生长趋于停止期)。
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Citations (2)
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CN105303299A (zh) * | 2015-10-12 | 2016-02-03 | 北京林业大学 | 一种确定森林生长模型的方法 |
CN109710889A (zh) * | 2018-12-13 | 2019-05-03 | 北京林业大学 | 一种基于树木年轮精确估计森林生产力的取样方法 |
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CN105303299A (zh) * | 2015-10-12 | 2016-02-03 | 北京林业大学 | 一种确定森林生长模型的方法 |
CN109710889A (zh) * | 2018-12-13 | 2019-05-03 | 北京林业大学 | 一种基于树木年轮精确估计森林生产力的取样方法 |
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常晨 等: "新一代森林调查技术体系及观测装备研发与应用", 《北京测绘》, vol. 32, no. 12, pages 1412 - 1417 * |
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