干旱荒漠区不同演替阶段白刺灌丛沙堆土壤呼吸特征及其影响因素分析

发布时间：2018-03-24 16:55

  本文选题：干旱荒漠区　切入点：白刺灌丛　出处：《西北林学院学报》2017年05期

【摘要】：为了研究干旱荒漠区不同演替阶段白刺土壤呼吸特征,探讨土壤呼吸对环境因子变化的响应,采用自动土壤二氧化碳通量监测系统,测定了不同演替阶段(雏形、稳定、发育、衰退)白刺灌丛沙堆的土壤呼吸速率,同步测定了土壤温度、水分等指标,分析了环境因子与土壤呼吸之间的关系。结果表明:1)不同演替阶段白刺灌丛沙堆土壤呼吸变化呈"单峰曲线"。土壤呼吸速率均值按大小顺序排列为稳定阶段雏形阶段发育阶段衰退阶段;2)4种演替阶段土壤呼吸速率与10cm处土壤温度之间有一定的相关关系,对白刺灌丛沙堆土壤温度可以解释雏形70.16%、发育82.67%、稳定87.81%、衰退88.73%的土壤呼吸变化;3)随着水分的增加,土壤呼吸速率也相应的增大,当土壤水分达到最高时,水分的限制作用减小,水分增加对土壤呼吸的促进作用减弱;4)各发育阶段不同坡位土壤呼吸日变化动态存在差异,但平均值都表现为迎风坡中部迎风坡底部迎风坡顶部背风坡中部背风坡底部。对不同演替阶段白刺灌丛沙堆土壤呼吸及其影响因素的研究有助于认识区域生态过程和全球气候变化。
[Abstract]:In order to study the characteristics of soil respiration in different succession stages and the response of soil respiration to environmental factors in arid desert region, the automatic soil carbon dioxide flux monitoring system was used to determine the different succession stages (embryonic shape, stability and development). The soil respiration rate of the Spurs shrub sandpile was measured simultaneously with soil temperature, moisture, etc. The relationship between environmental factors and soil respiration was analyzed. The results showed that the variation of soil respiration in different succession stages of Nitraria thunbergii showed a "single peak curve", and the mean value of soil respiration rate was arranged in order of magnitude and order as the embryonic shape of stable stage. There was a certain correlation between soil respiration rate and soil temperature in 10cm. The soil temperature of the Sand pile can explain the embryonic form of 70.16, develop 82.67, stabilize 87.81, decline 88.73% of the soil respiration.) with the increase of water, the soil respiration rate increases, and when the soil moisture reaches the maximum, the limiting effect of soil moisture decreases. (4) the diurnal changes of soil respiration in different slope positions were different in different development stages. But the average value is the bottom of the middle leeward slope in the middle of the windward slope. The study on the soil respiration and its influencing factors of the Spurs shrub sandpile in different succession stages is helpful to understand the regional ecological overpass. Cheng and global climate change.
【作者单位】： 甘肃省治沙研究所/甘肃河西走廊森林生态系统国家定位观测研究站定位研究站/甘肃省荒漠化与风沙灾害防治国家重点实验室培育基地/甘肃民勤荒漠草地生态系统国家野外科学观测研究站;
【基金】：国家自然科学青年基金项目“干旱区白刺灌丛沙堆发育过程的土壤呼吸时空变化特征及其影响因素”(31300595)
【分类号】：S714

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