中国旱作农田转为其它土地利用方式对土壤呼吸影响的整合分析研究  

Integrated Analysis of the Effects of Dry Cropland Conversion into Other Land-Use Patterns on Soil Respiration in China

作　　者：张彦军[1] 薛斯文 邹俊亮 党水纳 任媛媛 梁婷 

机构地区：[1]宝鸡文理学院地理与环境学院,陕西 宝鸡 [2]北京市农林科学院北京草业与环境研究发展中心,北京

出　　处：《土壤科学》2021年第2期19-30,共12页Hans Journal of Soil Science

摘　　要：土地利用方式转化会通过影响土壤有机碳(SOC)、土壤碳氮比(C:N)、土壤温度和土壤水分等因素影响土壤呼吸,但是这些因素之间存在着复杂的交互作用,且它们对土壤呼吸的相对贡献目前并不清楚。本文综合国内已经发表的69篇研究论文,利用Meta分析量化中国旱作农田转为果园、灌木林、自然草地、人工草地、天然林、人工林和混交林后对土壤呼吸的影响。研究结果显示,旱作农田转化为其它土地利用方式后会导致土壤呼吸的显著增加(P 20~50年(23.2%) 】10~20 年(19.6%) 】10年(12.9%)的趋势。土壤水分在旱作农田转化为果园、天然草地、人工草地、人工林、天然林和混交林后增加了6.7%~24.0%,但在转化为灌木林后降低了22.1%。土壤温度在旱作农田转化为果园、天然草地、灌木林、人工林、天然林和混交林后降低了2.8%~22.5%。SOC在旱作农田转化为天然草地、人工草地、人工林、天然林和混交林后增加了27.1%~352%。C:N在旱作农田转化为果园和混交林后降低了10.8%~42.1%,但在转化为灌木林、天然草地、人工草地、人工林和天然林后增加了8.9%~79.5%。中国旱作农田转为其它土地利用方式后,土壤呼吸的增加量与SOC、C:N、土壤温度和水分的变化量密切相关,且这些因素对土壤呼吸的贡献呈现出C:N 】土壤温度 】土壤水分 】SOC的趋势。因此,中国旱作农田转为其它土地利用方式后,C:N是影响土壤呼吸增加的重要因素。Land-use conversion could affect soil respiration through soil organic carbon (SOC), soil carbon and nitrogen ratio (C:N), soil temperature and soil moisture. However, these factors are not in- dependent but interact with each other, and their relative contribution to soil respiration in re-sponse to land-use conversion remains unknown. We synthesized 69 recently published papers in China using a meta-analysis approach to investigate the effect of dry cropland conversion into or-chard, shrub, natural grassland, artificial grassland, woodland, forest and mixed forest on soil res-piration. The results showed that in response to land-use conversion soil respiration increased by 12.2%~89.5%, with average increase of 19.5% in natural grassland, artificial grassland, shrub, woodland, forest and mixed forest, respectively. And the increase of soil respiration in response to dry cropland conversion into other land-use patterns showed the following patterns: 50 years (58.7%) >20~50 years (23.2%) >10~20 years (19.6%) >10 years (12.9%). Soil moisture increased by 6.7%~24.0% in orchard, natural grassland, artificial grassland, woodland, forest and mixed forest, but decreased by 22.1% in shrub, respectively. Soil temperature decreased by 2.8%~22.5% in orchard, natural grassland, shrub, woodland, forest and mixed forest, respectively. SOC increased by 27.1%~352% in natural grassland, artificial grassland, woodland, forest and mixed forest, respectively. C:N ratio decreased by 10.8%~42.1% in orchard and mixed forest, but increased by 8.9%~79.5% in shrub, natural grassland, artificial grassland, woodland and forest, respectively. The increase of soil respiration in response to dry cropland conversion into other land-use patterns was closely related with the increase of soil temperature and moisture, SOC and C:N ratio. Moreover, the contribution to the increase of soil respiration in response to dry cropland conversion into other land-use patterns showed the order of C:N >soil temperature >soil moisture >SOC. Th

关 键 词：土地利用方式转化 土壤呼吸 Meta分析 土壤温度和水分 土壤有机碳和土壤碳氮比 

分 类 号：S71[农业科学—林学]