昭苏山地草甸不同土地利用方式下的土壤呼吸特征及其水热关系的比较研究

发布时间：2018-12-21 20:41

【摘要】：为探讨不同土地利用方式对新疆昭苏马场山地草甸土壤呼吸速率的影响,对补播草地(RG)、豆禾混播草地(LG)、天然草地(NG)和农田(CR)进行测定,并分析了土壤呼吸速率与其影响因子间的关系。结果表明:(1)不同利用方式下各样地土壤呼吸日变化均随温度变化呈现出先增加后降低的变化态势,峰值在当地正午时分;月变化在2015年NG和CR呈现双峰值,RG和LG呈现单峰线,各处理均在8月小麦结实期达到最大值;2016年各处理出现峰值的时间不同,RG和LG在小麦的分蘖期达到最大值,NG和CR在小麦开花期达到最大值。(2)监测期内平均土壤呼吸速率由大到小为:NG、RG、CR、LG;各样地土壤呼吸CO_2排放量为:NGCRRGLG。(3)各样地土壤呼吸速率与土壤温度呈指数正相关,与体积含水量呈线性负相关,2015年Q_(10)值排序为RGCRNGLG,2016为NGLGCRRG。因此,补播和建植人工草地降低了土壤呼吸速率,使草地生态系统水热关系更加协调,减少了碳排放量,是昭苏地区退化草地生态恢复较好的选择。
[Abstract]:In order to study the effect of different land use patterns on soil respiration rate in mountain meadow of Zhaosu horse-farm in Xinjiang, the (NG) and (CR) of (LG), natural grassland and farmland (CR) were determined. The relationship between soil respiration rate and its influencing factors was analyzed. The results showed that: (1) the diurnal variation of soil respiration under different utilization patterns increased first and then decreased with the change of temperature, and the peak value was at noon; The monthly variation of NG and CR showed double peak in 2015, RG and LG showed a single peak line, and all treatments reached the maximum in August. The peak time of each treatment in 2016 was different, RG and LG reached the maximum at tillering stage of wheat, and NG and CR reached the maximum at flowering stage of wheat. (2) the average soil respiration rate during the monitoring period was from large to small: NG,RG,CR,LG;. Soil respiration CO_2 emission was: NGCRRGLG. (3. Soil respiration rate was positively correlated with soil temperature and negatively correlated with volume water content. Q _ (10) was ranked as RGCRNGLG,2016 as NGLGCRRG. in 2015. Therefore, the replanting and planting of artificial grassland can reduce the soil respiration rate, make the relationship between water and heat in grassland ecosystem more harmonious, and reduce the carbon emissions, which is a better choice for ecological restoration of degraded grassland in Zhaosu area.
【作者单位】：新疆农业大学草业与环境科学学院;新疆维吾尔自治区草地资源与生态重点实验室;
【基金】：农业部项目“国家牧草现代产业技术体系”(CARS35-02A) 中国科学院战略性先导科技专项“应对气候变化的碳收支认证及相关问题”(XDA05050405) 国家自然科学基金项目(31660692)
【分类号】：S812

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