退化花岗岩植被恢复对团聚体及其有机碳的影响  

Soil Water-Stable Aggregates and Organic Carbon Affected by Forestland Restoration of Degraded Granite

作　　者：蓝良就[1] 张野[2] 黄炎和[1] 李德成[3] 林金石[1] 彭绍云 

机构地区：[1]福建农林大学,福州350002 [2]赤峰市农牧科学研究院,赤峰024031 [3]中国科学院南京土壤研究所,南京210008 [4]福建省长汀县水土保持站,福建长汀366300

出　　处：《水土保持学报》2012年第1期190-194,199,共6页Journal of Soil and Water Conservation

基　　金：国家"十一五"科技支撑计划项目(2009BADC6B006)

摘　　要：研究退化红壤不同治理措施对土壤水稳性团聚体及其有机碳的影响。结果表明,恢复林地提高了0-20cm、20-40cm土层>0.25mm水稳性团聚体(WSA)含量和平均重量直径(MWD),显著提高土壤水稳性。表土中,大体上侵蚀林地WSA含量及其有机碳含量随粒径减小而增大,恢复林地随粒径增大而增大,并向>5mm、5～2mm两粒径富集,且侵蚀地、不同年代治理的林地、次生林间差异达显著水平(P<0.05);底土中,次生林、黑荆治理的林地WSA分布及有机碳含量变化与其表层的变化趋势相似,其他林地大体上向5～2mm、1～0.5mm两粒径富集。WSA含量及密度具有表聚性,且主要取决于治理年限、治理措施。In this paper,the distribution of soil water-stable aggregates（WSA） and its organic carbon contents in different forestland restoration were studied.Results showed that forestland resoration increased the content of WSA 0.25 mm and mean weight diameter（MWD） in 0-20 cm,and 20-40 cm soil layers,and enhanced the soil water stability significantly.In the 0-20 cm layer of erosion forestland＇s soil,the contents of WSA and organic carbon reduced as the increasing of soil particle size.On the contrary,the contents of WSA and organic carbon increased with the increasing of soil particle size in restore forestland soils,and organic carbon enriched in aggregates fractions over 2 mm.There were significant（P0.05） differences among soil erosion,restored forest and the secondary forest.In the 20-40 cm layer soil,the content of WSA and its organic carbon were similar to the surface layer in the secondary forest and Acacia mearnsii planting recovery soils,other newly recovery forestland＇s WSA and its organic carbon mostly appeared in aggregate fractions of 5～2 mm and 1～0.5 mm.The content of WSA was enriched in the surface layer,and mostly depended on the recovery time and the restoration measures.

关 键 词：水稳性团聚体 土壤有机碳 退化红壤 

分 类 号：S152.4[农业科学—土壤学] S153.62[农业科学—农业基础科学]