施肥对干热河谷生态恢复区林木生长及土壤碳氮含量的影响  

Effects of Fertilization on Tree Growth and Soil Carbon,Nitrogen Content at an Ecological Restoration Area in Dry-Hot Valley

作　　者：唐国勇[1] 李昆[1] 张昌顺[1] 

机构地区：[1]中国林业科学研究院资源昆虫研究所/国家林业局云南元谋荒漠生态系统定位观测站,云南昆明650224

出　　处：《水土保持学报》2009年第4期185-189,共5页Journal of Soil and Water Conservation

基　　金：国家"十一五"科技支撑计划专题(2006BAD03A0304);国家"十一五"科技支撑计划课题(2007BAD50B04)

摘　　要：对比研究了施肥对干热河谷生态恢复区4年生印楝（Azadirachta indicaA.）、新银合欢（Leucaena leuca-cephala）和大叶相思（Acacia auriliformisA.）生长量和土壤碳氮含量的影响。结果表明：雨季生长期内,施肥措施下印楝、新银合欢和大叶相思地径增量分别是不施肥的2.0倍、1.4倍和2.0倍,树高增量是不施肥的1.6倍、1.4倍和1.5倍。生态恢复区土壤有机碳（SOC）和全氮（TN）含量比恢复前高7.8%和19.1%。施肥对SOC和TN含量的方差贡献率（84.6%和75.4%）明显高于林分类型（39.3%和56.2%）。3类林分SOC含量在3.42~3.60 g/kg之间,大叶相思（0.62 g/kg）和新银合欢（0.57 g/kg）林地TN含量显著高于印楝（0.50 g/kg）。肥料配施处理下SOC和TN含量明显高于肥料单施,而不施肥处理含量最低。研究得出,施肥可以显著促进干热河谷人工林的生长,肥料配施效果尤为明显;施肥措施是生态恢复区SOC和TN含量变异的主要原因。该地区生态恢复时宜筛选根瘤菌可以侵染的树种。Fertilization effects on tree growth and soil organic carbon （SOC）, total nitrogen （TN） content in 4--year Azadirachta indica, Leucaena leucacephala and Acacia auriliformis stands were investigated at an ecological restoration area in dry--hot valley. Results showed that, during rainy season growth period, the increments of basal diameter and tree height of A. indica, L. leucacephala and A. auriliformis with fertilization were 2.0, 1.4 and 2.0 times and 1.6, 1.4 and 1.5 times to those without fertilization, respectively. SOC and TN content of restoration area were 7.8% and 19.1% higher than those before restoration, respectively. The variance contribution of fertilization on SOC and TN were obviously higher than that of stand type. SOC content ranged [rom 3.42 g/kg to 3.60 g/kg in the three stands. However, TN content in A. auriliforrnis （0.62 g/kg） and L. leucacephala stand （0.57 g/kg） were significantly higher than that in A. indica stand （0.50 g/kg）. SOC and TN content at combined application treatments were higher than those at single fertilization, whereas the lowest presented at no fertilizer. The results illustrate that fertilization obviously accelerate tree growth of stands in dry-hot valley, combined application in particular, and fertilization is the primary reason affected SOC and TN. And it is better to select tree species with rhizobium for ecological restoration at this region.

关 键 词：施肥 干热河谷 生态恢复 土壤有机碳 土壤全氮 

分 类 号：S714[农业科学—林学] S153.2