杉木林地不同更新方式土壤活性有机碳的分布及其碳库管理指数  

Distribution of Soil Labile Organic Carbon and Carbon Pool Management Index in Different Regeneration Patterns of Cunninghamia lanceolata Forest Lands

作　　者：张仕吉[1,2] 项文化[1,2,3] 徐桂林[1,2,3] 

机构地区：[1]中南林业科技大学,长沙410004 [2]南方林业生态应用技术国家工程实验室,长沙410004 [3]城市森林生态湖南省重点实验室,长沙410004

出　　处：《水土保持学报》2009年第4期213-217,226,共6页Journal of Soil and Water Conservation

基　　金：科技部公益性研究项目(2007415);国家野外科学观测研究站项目(20060515;20070822);国家林业局重点项目(200611;2007R23);湖南省科技厅重点项目(2006SK4059;2007SK4030)

摘　　要：研究了湖南会同杉木人工林采伐迹地不同更新方式土壤活性有机碳分布及其碳库管理指数。结果表明：不同更新方式下林地SOC含量、LOC含量在空间上分布极不均衡。随着土壤深度增加,SOC含量呈指数下降趋势（R2≥0.953 5）,LOC含量呈直线下降趋势（R2≥0.789 9）。SOC含量由高至低的排序为：板栗林地（14.759 g/kg）〉杉木林地（12.807 g/kg）〉自然更新林地（11.501 g/kg）〉芒草地（10.088 g/kg）。土壤LOC含量在1.00~1.80 g/kg之间,由高至低排序为：自然更新林地（1.744 g/kg）〉杉木林地（1.559 g/kg）〉芒草地（1.268 g/kg）〉板栗林地（1.119 g/kg）,林地土壤LOC分配比例在0.07~0.16之间,自然更新林最高,为0.152,板栗林最低,为0.076,自然更新林地碳库管理指数均最高,板栗林地最低。可见,杉木林采伐后不同更新方式对林地土壤有机碳的数量和质量产生了较大的影响。Distribution of soil labile organic carbon and carbon pool management index in different regeneration patterns of clear-cutting forest lands of Chinese fir plantation were studied at Huitong ecological station, Hffnan province. Results showed that spatial distribution of SOC, LOC concentration were extremely uneven in different regeneration patterns, the concentration of SOC had the exponential function decreasing trend （R^2≥0. 953 5）, and that of soil LOC had the linearly decreasing trend （R^2≥0. 789 9） with the increase of soil depth. The order of mean concentration of SOC was ranked as follows, chestnut woodland （14. 759 g/ kg）〉 Chinese fir plantation （12. 807 g/kg ）〉naturally regenerated woodland （11. 501 g/kg ）〉grass land （10. 088 g/kg）, the average concentration of soil LOC varied from 1.00 g/kg to 1.80 g/kg, and decreased horizontally as follows, naturally regenerated woodland （1. 744 g/kg）〉 Chinese fir plantation （1. 559 g/kg）〉grass land （1. 268 g/kg）〉chestnut woodland （1. 119 g/kg）. The average allocation proportion of soil LOC was ranged from 0.07 to 0.16 among different regeneration patterns, and that in natural regeneration wood-land was the highest （0. 152）, and that in chestnut plantation was minimum （0. 076 ）. The carbon pool management indexes of naturally regenerated woodland were the highest, the chestnut woodland was the lowest. Results also indicated that it was a pronounced effect on soil organic carbon quantity and quality to take different regeneration patterns after Chinese fir forest clear-cut.

关 键 词：杉木人工林 采伐迹地 更新方式 活性有机碳 碳库管理指数 

分 类 号：S153.62[农业科学—土壤学]