黄土丘陵区人工沙棘林土壤活性有机碳及碳库管理指数变化特征.doc

文档介绍：
黄土丘陵区人工沙棘林土壤活性有机碳及
碳库管理指数变化特征#
佟小刚1,韩新辉2,王海涛1,李明1**
5
10
15
20
25
30
(,杨凌 712100;
,杨凌 712100)
摘要:探讨了黄土丘陵区退耕人工种植 10~40 年沙棘林土壤有机碳库和碳库管理指数的变
化特征。结果表明:相比坡耕地,长期退耕还林使得 100cm 深不同土层总有机碳、活性有机
碳及碳库管理指数均呈显著增加趋势。其中以 0~20cm 表层土碳库增加最快,退耕 10~40
年持续使总有机碳和活性有机碳分别增加 ~ 和 ~;以 80~100cm 土层
增加最慢,基本到退耕 20 年才使土壤碳库显著增加,到 40 年时总有机碳和活性有机碳分别
提高 和 。土壤碳库管理指数受总有机碳和活性有机碳综合影响,到退耕 40
年时,其增幅最高出现 0~10cm 土层,达到 倍,最低出现在 40~60cm,为 倍。综
上分析,长期人工沙棘林恢复能够显著更新和提升土壤碳库,改良土壤质量。
关键词:土壤学;活性有机碳;碳库管理指数;黄土丘陵区
中图分类号:S158
Change characteristics of soil anic carbon and
carbon management index in the artificial Buckthorn of
Loess Hilly Area
TONG Xiaogang1, HAN Xinhui2, WANG Haitao1, LI Ming1
(1. College of Natural Resources and Environment, Northwest A & F University, Yangling
712100;
2. College of Agronomy, Northwest A & F University, Yangling 712100)
Abstract: Change characteristics of soil carbon pool and carbon management index (CMI) were
investigated under Buckthorn forestland, which have been converted from agriculture landuse for 10 to
40 years in Loess Hilly Area. The results showed that, compared with sloped farmland, the content of
total anic carbon(TOC),anic carbon and CMI of 0~100cm depth soil increased
significantly by long term returning farmland. the TOC and LOC in topsoil of 0~20cm were increased
with the fast ra