黄土高原草地和农田生态系统碳滞留时间及固碳潜力

郭丁; 李旭东; 王静; 傅华

doi:10.7522/j.issn.1000-694X.2017.00111

中国沙漠 >

2018 , Vol. 38 >Issue 2: 363 - 371

DOI: https://doi.org/10.7522/j.issn.1000-694X.2017.00111

生物与土壤

黄土高原草地和农田生态系统碳滞留时间及固碳潜力

郭丁 ,
李旭东 ,
王静 ,
傅华

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兰州大学草地农业生态系统国家重点实验室/农业部草牧业创新重点实验室/草地农业科技学院, 甘肃兰州 730020

郭丁(1986-),男,江苏宿迁人,讲师,主要从事草地生态学方面的研究。E-mail:dingg09@163.com

收稿日期: 2017-11-11

修回日期: 2017-11-21

网络出版日期: 2018-03-20

基金资助

国家重点研发计划项目（2016YFC0500505）；国家自然科学基金项目（31502010，41671106，31201838）；新疆维吾尔自治区重大科技专项（2016A03006）；草地农业生态系统国家重点实验室开放基金项目（SKLGAE201401）；中央高校基本科研业务费项目（lzujbky-2016-bt10，lzujbky-2017-kb11）；"111"引智基地项目（B12002）

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Estimation of Carbon Residence Times and Sequestration Potential of Grassland and Cropland Ecosystem in the Loess Plateau

Guo Ding ,
Li Xudong ,
Wang Jing ,
Fu Hua

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State Key Laboratory of Grassland Agro-ecosystems/Key Laboratory of Grassland Livestock Industry Innovation/College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China

Received date: 2017-11-11

Revised date: 2017-11-21

Online published: 2018-03-20

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摘要

采用概率反演分析法估算黄土高原草地和农田生态系统各碳库滞留时间及固碳潜力。结果表明：除农田植物地上部分外，植物地上部分、地下部分、代谢性凋落物及土壤活性有机碳库滞留时间最短，为25~203 d；惰性凋落物碳库滞留时间为2.4~3 a；慢性有机碳库和惰性有机碳库滞留时间最长，分别为57.4~79.6 a和593~598 a。多年生草地的根系滞留时间显著高于农田；而农田代谢性凋落物碳库和慢性有机碳库的滞留时间显著高于草地。根据反演所得参数模拟，在当前气候和土壤条件下，农田和草地系统土壤有机碳在250 a左右时达稳定状态，农田系统固碳潜力约为2 680 g C·m^-2，草地约为3 130 g C·m^-2。农田有机肥的输入能使土壤有机碳多固定4 000 g C·m^-2。有机肥的输入及土壤有机碳周转缓慢使耕作农田比草地更有利于土壤有机碳积累。

关键词： 反演分析; 滞留时间; 固碳潜力

本文引用格式

郭丁 , 李旭东 , 王静 , 傅华 . 黄土高原草地和农田生态系统碳滞留时间及固碳潜力[J]. 中国沙漠, 2018 , 38(2) : 363 -371 . DOI: 10.7522/j.issn.1000-694X.2017.00111

Abstract

A Bayesian probability inversion was applied to estimate the Carbon residence times and sequestration potential of grassland and cropland ecosystems in the Loess Plateau. The result shows that the shortest Carbon residence times ranged from 25 to 203 days were in the aboveground and belowground biomass pools, the metabolic litter pools and the active soil organic matter (SOC) pools, excluding the aboveground biomass pool in cropland. The structure litter pools had Carbon residence times between 2.4 and 3 years. The longest Carbon residence times were 57.4-79.6 years and 593-598 years in the slow and passive SOC pools, respectively. Carbon residences times for the belowground biomass pools were longer in grassland than those in cropland, whereas Carbon residences times in the metabolic litter and slow SOC pools in grassland were shorter than those in cropland. According to the parameters derived from the inversion model, the SOC pools in grassland and cropland would reach a stable state in 250 years. The Carbon sequestration potential would be 3 130 and 2 680 g C·m^-2, respectively, in grassland and cropland ecosystems. The application of manure could result in higher (4 000 g C·m^-2) Carbon sequestration. Compared to that in grassland, the application of manure and the longer Carbon residence times of soil pools could lead to higher SOC sequestration in cropland ecosystem.

Key words： inverse analysis; residence time; carbon sequestration potential

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