岷江上游山地森林/干旱河谷交错带退耕还林后土壤养分变化和微生物分布特征  

Soil Nutrient Status and Microbiological Properties in the Mountain Forests/Arid Valley Ecotone in the Upper Reaches of Minjiang River after Converting Farmland to Forest

作　　者：易海燕[1] 宫渊波[1] 陈林武[1,2] 张敏[1] 唐春香[1] 黄正全[1] 陈鑫[1] 

机构地区：[1]四川农业大学长江上游林业生态工程省级重点实验室,四川雅安625014 [2]四川省林业科学研究院,成都610081

出　　处：《水土保持研究》2010年第2期130-135,共6页Research of Soil and Water Conservation

基　　金："十一五"国家科技支撑计划重大项目(2006BAC01A11);四川农业大学211工程创新团队项目

摘　　要：通过实地调查与实验分析,对岷江上游山地森林/干旱河谷交错带退耕还林后土壤养分状况和微生物数量特征进行研究。结果表明:土壤有机质、全N含量为交错带山地森林段>交错带山地森林下缘地段>干旱河谷地段;土壤全P含量为交错带山地森林下缘地段>交错带山地森林段>干旱河谷地段;土壤pH值为干旱河谷地段>交错带山地森林下缘地段>交错带山地森林段;土壤真菌、细菌、放线菌、氨化菌以及固氮菌的数量随海拔的升高先增多后减少,纤维素分解菌的数量随海拔的升高而增多。同时,通过对交错带山地森林下缘3种植被恢复模式研究表明,恢复植被能显著提高土壤的养分,增加微生物的数量。土壤养分和微生物数量变化均具有明显的空间层次现象,即随土层的加深呈降低的趋势。本研究区域土壤微生物数量与土壤养分密切相关。Through field investigation and experiment analysis, the soil nutrient status and microbiological quantita- tive trait of the mountain forests/arid valley ecotone in the upper reaches of Minjiang river after converting farm- land to forest was studied. The results showed that the soil organic matter and total nitrogen were in the order as the mountain forests^the lower edge of the mountain forest^the arid valley; for phosphorus as the lower edge of the mountain forest^the mountain forests2〉the arid valley~ for soil pH as the arid valley^the lower edge of the mountain forest^the mountain forests, growing in number with the increase of soil depth. With the increase of the elevation, the numbers of fungi, bacteria, actinomycetes, ammonifiers and azotobacteria increased firstly and then reducd, while the numbers of cellulose--decomposing bacteria increased gradually. Meanwhile, through the investigation on the 3 different vegetation recovery models in the same elevation, the results showed that vegetation restoration could improve soil nutrient and increase the number of microbiological. Both the soil nutrients and microbiological properties were decreasing with the increase of soil depth. In this study, there is close correlation between soil microorganism and soil nutrient.

关 键 词：山地森林/干旱河谷交错带 土壤养分 土壤微生物 植被恢复 

分 类 号：S152.6[农业科学—土壤学] S154.3[农业科学—农业基础科学]