华西雨屏区不同人工植被类型下土壤氮库及其有效性  

Effects of Planted Vegetations on Soil Nitrogen Pool in Rainy Area of West China

作　　者：江利平[1] 杨万勤[1] 崔松[1] 

机构地区：[1]四川农业大学成都校区,成都611130

出　　处：《世界科技研究与发展》2012年第4期539-541,共3页World Sci-Tech R&D

基　　金：国家科技支撑计划(2011BAC09B05);四川省科技支撑计划(2010NZ0051);四川高等学校科技创新重大培育计划(2007ZZ024;09ZZ023);四川省杰出青年学术技术带头人资助计划(2012JQ0008;2012JQ0059)资助

摘　　要：为了解华西雨屏区人工植被类型对土壤氮库及其有效性的影响,选取华西雨屏区7种典型人工植被类型:橘树(Glycosmiscochinchinensis)迹地、橘树林地、巨桉(Eucalyptus grandis)林地、玉米(Zea mays)地、香樟(Cinnamonum camphora)林地、柚子(Citrusmaxima)林地和桃树(Prunus persica)林地,于2010年7月分别采集土壤根层与根下层原状土样,分析其氮库及有效性。结果表明,华西雨屏区几种典型人工植被类型均表现出较大的氮库特征,但不同人工植被类型间具有较大的差异。相对于其他植被类型,玉米地根层和根下层土壤氮库均相对较小,而橘树、柚子和桃树林地根层土壤氮库相对较大,巨桉、香樟和桃树林地根下层土壤氮库相对较大。然而,玉米地具有较高的根层土壤铵态氮和硝态氮含量,但巨桉林地具有较低的根下层土壤铵态氮和硝态氮含量。这些结果为区域氮素合理利用、土地利用结构调整以及生态环境建设提供了一定理论依据。To understand the effects of planted vegetations on soil N pool and its availability in Rainy Area of West China, 7 representative vegetations were selected including orange cutver plantation, orange plantation, eucalyptus plantation, corn farmland, camphor plantation, grapefruit plantation and peach plantation. Soils were sampled in the root layer and under-root layer in July,2010. Soil N content and available N （ NH4-N and NO3 -N ） content were analyzed, and soil N pool was calculated. The results indicated that there were significant effects of planted vegetation on soil N pool, but the effects were different under different vegetations. Compared with other vegetations, corn farmland showed relative lower soil N pools in both root layer and under-root layer. Orange plantation, grapefruit plantation and peach plantation had higher soil N pools in root layer, but camphor plantation, eucalyptus plantation and peach plantation displayed higher soil N pools in under- root layer. However, higher NH4-N and NO3 -N contents were observed in root layer of corn farmland, but lower ones were detected in under- root layer of eucalyptus plantation. The results here provide some efficient data for regional N utilization, land using and environment construction.

关 键 词：氮库 有效氮 华西雨屏区 人工植被类型 

分 类 号：S714[农业科学—林学]