CN101433173A - Method for determining initial density in planting arrangement of water source protection forest - Google Patents
Method for determining initial density in planting arrangement of water source protection forest Download PDFInfo
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- CN101433173A CN101433173A CNA2008102401913A CN200810240191A CN101433173A CN 101433173 A CN101433173 A CN 101433173A CN A2008102401913 A CNA2008102401913 A CN A2008102401913A CN 200810240191 A CN200810240191 A CN 200810240191A CN 101433173 A CN101433173 A CN 101433173A
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- Prior art keywords
- tree
- projected area
- planting
- density
- forest
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/22—Improving land use; Improving water use or availability; Controlling erosion
-
- 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
- Y02P60/40—Afforestation or reforestation
Abstract
The invention discloses a method for determining the initial planting afforestation density of water protection forest. The method comprises the following steps of mastering the law that the crown projection area of a tree species on a site changes with forest age by surveying the situation of the forest age and crown projection area of cultured forestland with similar site conditions and the same tree species in a young forest period, figuring out the crown projection area in an age limit according to the requested age limit of young forest, and determining the initial planting afforestation density of the tree species according to desired canopy density of the age limit. The method can reasonably determine the reasonable initial planting density of main afforestation tree species of the water protection forest, and fundamentally solves the problems of empirical feature and arbitrariness in the prior art.
Description
Technical field
The present invention relates to a kind of planting density and determine method, relate in particular to a kind of method of definite initial density in planting arrangement of water source protection forest.
Background technology
Planting density is meant the quantity of planting point or sowing cave on the unit are planting site, also claims initial density in planting.The afforestation initial density in planting is the problem of puzzlement afforestation always, and the different seeds of forest, seeds and land occupation condition should have different afforestation initial density in planting.Arrangement of water source protection forest density not only directly affects the process of growth of forest and the degree of stability of standing forest, is concerning the size of its protection benefit especially.The afforestation initial density in planting is too little, is unfavorable for that stable and microclimate forest of standing forest can not form, and the improvement of soil, the implicit function of moisture be can not get performance, is difficult to reach due protection benefit; The afforestation initial density in planting is excessive, aggravates the competition to moisture and nutrition space easily, and the management input can increase along with the increase because of density after cost of forestation and the afforestation.
In the prior art, determine that the method for afforestation initial density in planting is determined by experience usually, or determine as required.
There is following shortcoming at least in above-mentioned prior art:
Randomness is stronger, is difficult to reasonably determine planting density.
Summary of the invention
The purpose of this invention is to provide a kind of method that can reasonably determine initial density in planting arrangement of water source protection forest.
The objective of the invention is to be achieved through the following technical solutions:
The method of definite initial density in planting arrangement of water source protection forest of the present invention comprises:
According to intending reproducting tree species, and wish the crown density that reach in limited time, and determine the initial density in planting of these seeds according to following formula in this year in the tree crown projected area of prescribing a time limit in desired young growth year:
D=10000C/S, in the formula:
D is an initial density in planting, unit: strain/hectare;
S be described tree kind in the tree crown projected area of prescribing a time limit in desired young growth year, unit: square metre;
C is that described tree kind is in the crown density of wishing that described plan afforestation reaches desired young growth year in limited time.
As seen from the above technical solution provided by the invention; the method of definite initial density in planting arrangement of water source protection forest of the present invention; because according to intending reproducting tree species in the tree crown projected area of prescribing a time limit in desired young growth year; and according to the crown density of wishing in limited time that in this year this plan afforestation reaches; utilize formula D=10000C/S to determine the initial density in planting of these seeds, can reasonably determine planting density.
Embodiment
The method of definite initial density in planting arrangement of water source protection forest of the present invention; its preferable embodiment is; according to intending reproducting tree species in the tree crown projected area of prescribing a time limit in desired young growth year; and, utilize following formula to determine the afforestation initial density in planting of these seeds in limited time according to the crown density of wishing in this year to reach:
D=10000C/S, in the formula:
D is an initial density in planting, unit: strain/hectare;
S be described tree kind in the tree crown projected area of prescribing a time limit in desired young growth year, unit: square metre;
C is that described tree kind is in the crown density of wishing that described plan afforestation reaches desired young growth year in limited time.
Above-mentioned tree kind can obtain by data of the prior art in the tree crown projected area of prescribing a time limit in desired young growth year, also can obtain by experience, also can obtain by inquiry.
As obtaining by the following method:
At first, the existing planting site of similar by inquiry land occupation condition, identical seeds obtains and intends the rule model that reproducting tree species change with the age of stand in the forest tree crown projected area in young growth period;
Then, obtaining this tree by above-mentioned model plants in the tree crown projected area of prescribing a time limit in desired young growth year.
Concrete tree kind can be that mathematical model obtains by other also by choosing with an acquisition in the drag in the rule that the forest tree crown projected area in young growth period changed with the age of stand:
S=aA+b, S=alnA+b, S=aA
2+ bA+c, S=aA
b+ c, S=ae
BA+ c, S=alnA-b, in the formula: S is the tree crown projected area; A is the age of stand; A, b, c are parameter.
When choosing model, a plurality of models are carried out match, choose correlation R afterwards with the investigation age of stand and tree crown projected area data
2Maximum model.
The selected model of desired young growth year limit value substitution, calculate and obtain described tree kind in the tree crown projected area of prescribing a time limit in desired young growth year.
The present invention passes through the age of stand and the tree crown projected area data thereof of the similar land occupation condition of being investigated, the existing planting site of identical seeds, set up the rule model that the tree crown projected area changed with the age of stand, try to achieve the tree crown projected area of this time limit then according to the desired young growth time limit, and, determine the initial density in planting of these seeds according to the crown density that hope reaches.Can reasonably determine planting density.
Below to the further detail analysis of the specific embodiment of the present invention:
At first, according to the age of stand and the tree crown projected area data thereof of investigation with the existing planting site young growth of intending the similar land occupation condition of planting site, identical seeds, match tree crown projected area and the numerical relationship model S=f between the corresponding age of stand (A) are by correlation analysis (R
2Deng) select optimal models.Tree crown projected area and the common mathematical model between the corresponding age of stand have: S=aA+b, S=alnA+b, S=aA
2+ bA+c, S=aA
b+ c, S=alnA-b, S=ae
BA+ c etc., wherein: S is the tree crown projected area of every strain tree, unit: square metre; A is the age of stand, unit: year; A, b, c are parameter.
Then by determined model; according to the desired young growth time limit in water conservation district; calculate this time limit tree crown projected area; and determine the afforestation initial density in planting D of each seeds according to the crown density that hope reaches; D=10000C/S, wherein D is initial density in planting (strain/hectare), S be every strain tree the tree crown projected area (square metre); 10000 is 10000 square metres of unit ares (promptly 1 hectare), the crown density of C for reaching.
Specific embodiment:
According to water resource protection forest zone, Hebei province being had now the analysis of locust tree young growth growth probe, obtaining its tree crown projected area and the optimal mathematical model between the corresponding age of stand be:
S=5.70lnA-5.65, relative coefficient R
2=0.97, n=75 is counted in the investigation strain.
Require to reach 0.7 if wish the crown density of this place locust tree in the time of 5 years, obtain similar land occupation condition water resource protection forest zone, this place locust tree initial density in planting according to formula N=10000C/S and should be N=10000 * 0.7 ÷ (5.70 * ln5-5.65)=1987 strain/hectares.
More of the prior artly determine that the method for protective forest initial density in planting has certain experience and arbitrariness usually.The present invention changes to determine the method for the reasonable initial density in planting of the main reproducting tree species of protective forest in conjunction with the tree crown projected area in the tree growth process with the age of stand, has fundamentally solved the problems such as empirical and arbitrariness of existing method.Applied widely and convenient and easy; existing by inquiry similar land occupation condition is the tree crown projected area situation of change in this seeds growth of young plantations process of planting site; match is a plurality of and choose a model of correlation maximum; then this model of desired young growth time limit substitution is tried to achieve the tree crown projected area of this time limit; and, just can determine the initial density in planting of this seeds protective forest of this area according to the crown density that hope reaches.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (5)
1, a kind of method of definite initial density in planting arrangement of water source protection forest is characterized in that, comprising:
According to intending reproducting tree species, and wish the crown density that reach in limited time, and determine the initial density in planting of these seeds according to following formula in this year in the tree crown projected area of prescribing a time limit in desired young growth year:
D=10000C/S, in the formula:
D is an initial density in planting, unit: strain/hectare;
S be described tree kind in the tree crown projected area of prescribing a time limit in desired young growth year, unit: square metre;
C is that described tree kind is in the crown density of wishing that described plan afforestation reaches desired young growth year in limited time.
2, require the method for described definite initial density in planting arrangement of water source protection forest according to right 1, it is characterized in that, described tree kind obtains by the following method in the tree crown projected area of prescribing a time limit in desired young growth year:
At first, the existing planting site of similar by inquiry land occupation condition, identical seeds obtains the rule that described tree kind changes with the age of stand in the forest tree crown projected area in young growth period;
Then, obtain described tree kind in the tree crown projected area of prescribing a time limit in desired young growth year by above-mentioned rule.
3, require the method for described definite initial density in planting arrangement of water source protection forest according to right 2, it is characterized in that, the rule that the forest tree crown projected area in described seeds young growth period changed with the age of stand is by choosing with an acquisition in the drag:
S=aA+b, S=alnA+b, S=aA
2+ bA+c, S=aA
b+ c, S=ae
BA+ c, S=alnA-b, in the formula: S is the tree crown projected area; A is the age of stand; A, b, c are parameter.
4, require the method for described definite initial density in planting arrangement of water source protection forest according to right 3, it is characterized in that, with the investigation age of stand and tree crown projected area data a plurality of models are carried out match when choosing model, choose the model of correlation maximum afterwards.
5, require the method for described definite initial density in planting arrangement of water source protection forest according to right 3; it is characterized in that; obtain described tree kind in the tree crown projected area method of prescribing a time limit in desired young growth year,, calculate for the selected model of desired young growth year limit value substitution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102401913A CN101433173A (en) | 2008-12-18 | 2008-12-18 | Method for determining initial density in planting arrangement of water source protection forest |
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| CNA2008102401913A CN101433173A (en) | 2008-12-18 | 2008-12-18 | Method for determining initial density in planting arrangement of water source protection forest |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105165365A (en) * | 2015-10-12 | 2015-12-23 | 北京林业大学 | Method for designing and regulating stand density of timber forest according to crown breadth and diameter class |
| CN105379606A (en) * | 2015-10-12 | 2016-03-09 | 北京林业大学 | Method for implementing afforestation design of protection forest by using forest growth model |
| CN106815449A (en) * | 2017-03-20 | 2017-06-09 | 北京林业大学 | A kind of determination method on individual plant young apple tree crown mapping border |
| CN107656904A (en) * | 2017-09-04 | 2018-02-02 | 中国林业科学研究院林业研究所 | A kind of method for determining the artificial forest density of plantation |
-
2008
- 2008-12-18 CN CNA2008102401913A patent/CN101433173A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105165365A (en) * | 2015-10-12 | 2015-12-23 | 北京林业大学 | Method for designing and regulating stand density of timber forest according to crown breadth and diameter class |
| CN105379606A (en) * | 2015-10-12 | 2016-03-09 | 北京林业大学 | Method for implementing afforestation design of protection forest by using forest growth model |
| CN106815449A (en) * | 2017-03-20 | 2017-06-09 | 北京林业大学 | A kind of determination method on individual plant young apple tree crown mapping border |
| CN107656904A (en) * | 2017-09-04 | 2018-02-02 | 中国林业科学研究院林业研究所 | A kind of method for determining the artificial forest density of plantation |
| CN107656904B (en) * | 2017-09-04 | 2021-02-26 | 中国林业科学研究院林业研究所 | Method for determining density of artificial forestation |
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Open date: 20090520 |