黄土丘陵沟壑区沙棘人工林不同恢复阶段物种多样性与土壤肥力的关系研究  

Relationship between species diversity in different restoration stages of Hippophae rhamnoides ssp. sinensis plantations and soil fertility in the hilly and gully regions of Loess Plateau

作　　者：李登武[1] 张文辉[1] 任争争[2] 王敏茹 

机构地区：[1]西北农林科技大学林学院,陕西杨凌712100 [2]西北农林科技大学生命科学学院,陕西杨凌712100 [3]延安市天然林保护办公室,陕西延安716000

出　　处：《干旱地区农业研究》2007年第5期25-30,共6页Agricultural Research in the Arid Areas

基　　金：国家自然科学基金(30671672);中国科学院知识创新项目(KZCX1-06)

摘　　要：对黄土高原丘陵沟壑区沙棘人工林不同恢复阶段物种多样性与土壤肥力的关系进行了研究。结果表明,在沙棘人工林恢复的初、中期阶段,α-多样性指数和土壤肥力(有机质含量和氮含量)的增加正相关较明显,在恢复的中期β-多样性指数变化较强烈,且土壤有机质含量变化较大,表现出在沙棘人工林恢复的同时,土壤有机质含量也会有所增加,二者基本上是同步的。对土壤肥力与沙棘人工林植物组成性状的关系进行多元回归分析后发现,土壤全氮与木本植物种数、植物种数和物种多样性等因素有关;全磷与物种多样性等因素有关;土壤全钾和pH值的变化比较复杂,与植物组成性状的关系不明显。A Study was made on the relationship between species diversity in different restoration stages of Hippophae rhamnoides ssp. sinensis plantations and soil fertility in the hilly and gully region of Loess Plateau. The results showed that the index of α-diversities and the content of organic matter and nitrogen were obviously in positive correlation in the early stage and middle period stage of Hippophae rhamnoides ssp. sinensis plantations restoration, the greater change of the index of B-diversities occurred in the middle period stages of Hippophae rhamnoides ssp. sinensis plantations restoration, and the content of organic matter changed comparatively large, while Hippophae rhamnoides ssp. sinensis plantations restored, the content of organic matter increased, their changes were basically in the same step. An analysis of multivariate regression on relationship of soil fertility and plant composition characteristic, the results showed that the content of the nitrogen was related to the number of woody plants, plants and species diversity, the content of the phosphate was related to plant species diversity. The changes of the content of potassium and pH of soil was comparatively complicated, and wasn＇t obviously related to plant composition characteristics.

关 键 词：沙棘人工林 物种多样性 土壤肥力 黄土丘陵沟壑区 

分 类 号：S793.6[农业科学—林木遗传育种] S718.516[农业科学—林学]