| 唐龙,郝文芳,孙洪罡,梁宗锁.黄土高原四种乡土牧草群落种—面积曲线拟合及最小面积的确定[J].干旱地区农业研究,2005,(4):83~88 |
| 黄土高原四种乡土牧草群落种—面积曲线拟合及最小面积的确定 |
| Fitting and assessment of species-area curves of four native pasture communities on Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2005.04.17 |
| 中文关键词: 黄土高原 植物群落 种—面积曲线 拟合 |
| 英文关键词:Loess Plateau plant community species-area curve fit |
| 基金项目:中国科学院知识创新基金(KZCX01-06-2-4)； 国家自然科学基金西部生态建设计划项目“黄土高原森林—草原过渡带植被演替过程的水分平衡与调控机理”(90302005) |
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| 中文摘要: |
| 探讨了黄土高原4种乡土牧草的种-面积曲线应遵从的基本条件,分别对7个经典模型进行拟合,从中确定以下4个模型作为研究方法,S=b+alnA、S=aln(bA+1)、S=aAb、S=aA/(1+bA),采用了SAS8.1、MATLAB6.5系统对其分别进行拟合求解及作图,以F值检验结果作为评价指标,检验后淘汰前三个模型,以曲线S=aA/(1+bA)作为标准,提出求取该曲线的二阶导数,以其二阶导数趋于0的点为群落的最小面积的新方法,并得出达乌里胡枝子、无芒隐子草、冰草、白羊草的群落最小面积分别为3.4、4.1、1.4、4.8 m2。由于4个群落都符合该模型故可以认为它是黄土高原草本植物群落的种-面积曲线的最优模型。 |
| 英文摘要: |
| According to the investigation scale and the research purpose, the basic conditions for species-area curves on Loess Plateau have been analyzed. Four typical models were adopted in the study: (S=b+alnA,) S=aln(bA+1), S=aAb, S=aA/(1+bA). With the aid of SAS8.1 and MATLAB6.5 system, the first three models were fallen into disuse according to the F value of fitting curves. The model S=aA/(1+bA) was regarded as the standard curve to get second derivative species-area for the communities of Lespedeza davurica (Laxm.) Schindl, Cleistogenes songorica (Roshev) Ohwi, Agropyron cristatum (L.) Gaertn,and Bothriochioa ischaemum (L.) Keng, that is, 3.4 m2, 4.1 m2, 1.4 m2 and 4.8 m2. Since this model fitted all the communities well, it was considered as the best species-area model for the herbage plant communities on Loess plateau. |
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