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当前位置: 首页 > 文章 > 黄土台塬不同土地利用方式对土壤有机碳氧化稳定性及酶活性的影响 农业环境科学学报 2012,31 (12) 2415-2424
Position: Home > Articles > Effects of Land-use Type on Soil Organic Carbon Oxidability and Enzyme Activities in the Tablelands of the Loess Plateau Journal of Agro-Environment Science 2012,31 (12) 2415-2424

黄土台塬不同土地利用方式对土壤有机碳氧化稳定性及酶活性的影响

作  者：
刘梦云;付东磊;常庆瑞;齐雁冰
单  位：
西北农林科技大学资源环境学院;农业部西北植物营养与农业环境重点实验室
关键词：
黄土台塬;土地利用方式;易氧化态碳;碳库管理指数;酶活性
摘  要：
以黄土台塬乔木、灌木、乔灌混交、草和农田为对象,进行了不同土地利用方式土壤易氧化态碳、酶活性研究。结果表明:(1)与耕地相比,林地和草地土壤易氧化态碳含量及其分配比例分别提高了171%～218%、55%～71%,碳库指数、碳库活度指数和碳库管理指数(CPMI)分别提高了73%～116%、103%～163%和233%～330%,有机碳氧化稳定系数降低了15%～21%(0～5cm土层)。(2)草地和乔木林地土壤过氧化氢酶活性略高于其他;0～5cm土层,草地和林地土壤碱性磷酸酶、蔗糖酶活性分别高于耕地98%～211%、88%～117%;灌木林地脲酶活性分别高于耕地、天然草地69%和144%。(3)0～5、5～20cm和20～40cm土层,CPMI敏感系数为其他参数的1.29～14.58倍;各酶活性相比较,土壤脲酶活性能更好地体现有机碳氧化稳定性强弱和碳库活度,碱性磷酸酶和蔗糖酶活性可较好体现土壤有机碳总体水平和转化程度;4种酶活性与CPMI达显著以上正相关水平。因此,土壤CPMI可作为土地利用方式对土壤影响和碳固定的评价因子。
译  名：
Effects of Land-use Type on Soil Organic Carbon Oxidability and Enzyme Activities in the Tablelands of the Loess Plateau
作  者：
LIU Meng-yun,FU Dong-lei,CHANG Qing-rui,QI Yan-bing(Key Laboratory of Northwest Plant Nutrition and Agriculture Environment/Ministry of Agriculture;College of Resources and Environment,Northwest A & F University,Yangling 712100,China)
关键词：
tablelands of the Loess Plateau;land-use types;easily oxidizable organic carbon;CPMI;enzyme activities
摘  要：
Soil organic carbon sequestration was significantly affected by land-use types in Loess Plateau areas.This study selected five land-use types,namely arbor,shrub,arbor-shrub mixed,grass and farmland to investigate soil easily oxidizable organic carbon and enzyme activities,and to determine evaluation index of soil carbon sequestration.The results showed that:(1) Compared with farmland,soil easily ox-idizable organic carbon(EOC) content and its proportions(to total soil carbon) increased significantly for 171%～218% and 55%～71% re-spectively for forestland and grassland,as well as carbon pool index,activity index and carbon pool management index(CPMI) were en-hanced for 73%～116%,103%～163% and 233%～330% respectively.While soil oxidation stability coefficient decreased for 15%～21%(0~5 cm depth)(.2) Slight differences of soil catalase activity were found among 5 land-use types.Soil catalase activity in natural grassland and ar-bor forestland were slightly higher than that in other land-use types,while these differences became larger gradually with the depth increas-ing.In the surface layer(0~5 cm),soil alkali-phosphatase and inverse activities in grassland and forestland were higher than farmland for 98%～211% and 88%～117% respectively.Soil urease activity in shrub forestland was higher than that in farmland and grassland for 69% and 144% respectively.Except urease activity,soil enzyme activities in farmland were lower than in other land-use types.(3) The sensitivity of CPMI in the depth of 0~5 cm,5~20 cm and 20~40 cm were 1.52～13.07 times,1.29～11.51 times and 1.58～14.58 times of SOC,EOC and ox-idability indexes sensitivity respectively(.4) Correlation analysis indicated that soil urease activity could reflect the oxidation stability of soil organic carbon and carbon pool activity than other soil enzyme activities.Soil alkali-phosphatase and inverse activities could represent the overall level of soil organic carbon and organic carbon conversion degree than other soil enzyme activities.CPMI showed significant positive correlations with four enzyme activities.Therefore,CPMI could be used as one of the indicators for land use change assessment,and could be regarded as measurable index for carbon sequestration.

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