刺槐林和柠条林土壤剖面理化性质对比及相关性分析  

Correlation Analysis and Comparison of Soil Physicochemical Properties of Robinia pseudoacacia Forest and Caragana korshinskii Forest

作　　者：吕海波[1,2] 梁宗锁[1,3] 

机构地区：[1]中国科学院水利部水土保持研究所,陕西杨凌712100 [2]渭南师范学院,陕西渭南714000 [3]西北农林科技大学生命学院,陕西杨凌712100

出　　处：《中国水土保持》2012年第4期28-31,68,共4页Soil and Water Conservation in China

基　　金：中国科学院知识创新项目(KZCX2-XB2-05-01);渭南师范学院科研计划项目(07YKZ056)

摘　　要：为了研究黄土高原退耕林地土壤理化性质变化特征,探索土壤剖面不同深度土壤有机碳(SOC)及相关因素的相互响应机制,对安塞县纸坊沟流域1975年柠条林(N75)、1974年农地(H74)和1978年刺槐林(C78)100 cm深度土壤剖面的有机碳、全N、粒度、碳酸钙进行了差异度分析和线性相关性分析,结果表明:两个退耕林地SOC和全N含量在0—100 cm深度都有增加,但是C78主要表现在0—20 cm深度,而N75则主要表现在20—100 cm深度。相关度分析表明,H74在20—100 cm深度SOC含量、C/N值与0.002—0.02 mm粒径含量达显著、极显著相关,C78在40—100 cm深度SOC含量与<0.002 mm粒径含量显著相关,C/N值与<0.02 mm粒径含量由0—100 cm的负相关变为正相关。结果证明,退耕后柠条林地SOC和全N含量的变化主要表现在深层土壤上,刺槐林地的变化则主要表现在浅层土壤上;农地和刺槐林地深层土壤SOC主要吸附在细颗粒土壤上,性质较稳定。In order to study the variation characteristic of soil physicochemical properties after conversion of cropland to forest in the Loess Plateau and explore the soil organic carbon(SOC) at different depth of soil profile and the mutual response mechanism of related factors,the paper analyzed the difference degree and linear relativity of the quantity of SOC,total nitrogen,particle size and CaCO3 of soil profile at 100 cm depth of Caragana korshinskii forest planted in 1975(N75),cultivated land since 1974(H74) and Robinia pseudoacacia forest planted in 1978(N78) in Zhifanggou drainage basin of Ansai County.The outcomes show that: the quantity of SOC and total nitrogen in two restored forest sites have been increased at 0-100 cm depth,while the diversity in C78 mainly shows at the depth of 0-20 cm and N75 at 20-100 cm.At 20-100 cm in H74 site,SOC and C/N show remarkable correlations with 0.002-0.02 mm particle size.At 40-100 cm in C78 site,SOC is remarkable correlation with <0.002 mm particle size,and the correlation rate between C/N and <0.02 mm particle size changes from minus value of 0-100 cm depth to positive value of 40-100 cm.The study shows that: after conversion of cropland to forest,the changes of SOC and total nitrogen of Caragana Korshinskii forest mainly present a obvious diversity in deep soil layer;but the diversity of Robinia pseudoacacia forest mainly shows in surface layer;SOC of cultivated land and Robinia pseudoacacia forest is closely adsorbed to the soil of fine particle size in deep layer with steady nature.

关 键 词：刺槐林 柠条林 土壤理化性质 土壤有机碳 粒度 黄土高原 

分 类 号：S714[农业科学—林学]