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为阐明板栗林土壤呼吸对水土保持措施的响应,采用IRGA法,对不同类型板栗林的土壤呼吸从2009年3月至2010年9月开展为期1年半的定位观测。结果表明:1)采取水土保持措施后,样地的土壤水分状况得到一定程度的改善,尤其随着采取水土保持措施年限的延长,其对土壤水分时空分布影响更为显著。2)4个板栗林样地的土壤呼吸速率均呈明显的单峰曲线变化,水土保持措施对土壤呼吸的季节动态无明显影响。3)样地Ⅰ和Ⅲ的参考呼吸R10分别为1.718和1.595μmol/(m2.s);而采取水土保持措施后,样地Ⅱ和Ⅳ的R10均表现为一定程度的降低,分别为1.092和1.324μmol/(m2.s)。样地Ⅰ和Ⅲ的土壤呼吸的温度敏感性指数Q10分别为1.927和1.899;采取水土保持措施后,样地Ⅱ和Ⅳ的Q10均表现为略微增加。采取水土保持措施后,土壤温度和土壤湿度对土壤呼吸速率的影响有一定程度的增强。研究结果可为把水土保持措施作为土壤严重侵蚀地区一种潜在的固碳减排模式提供基础数据。
In order to clarify the response of soil respiration of chestnut forest to soil and water conservation measures, the soil respiration of chestnut forest was studied by IRGA from March 2009 to September 2010 for a year and a half. The results showed that: 1) The soil moisture status of the plots improved to a certain degree after soil and water conservation measures were taken. Especially with the extension of soil and water conservation measures, the spatial-temporal distribution of soil moisture was more significant. 2) The soil respiration rate of four chestnut forest plots showed obvious single peak curve changes, and the soil and water conservation measures had no significant effect on the seasonal dynamics of soil respiration. 3) The reference respiration R10 of plots Ⅰ and Ⅲ were 1.718 and 1.595μmol / (m2.s), respectively. After soil and water conservation measures were taken, the R10 of plots Ⅱ and Ⅳ decreased to some extent, 1.092 and 1.324 μmol / (m2.s). The temperature sensitivity index (Q10) of soil respiration in samples Ⅰ and Ⅲ were 1.927 and 1.899, respectively. After soil and water conservation measures were taken, Q10 of samples Ⅱ and Ⅳ showed slight increase. After adopting soil and water conservation measures, the effects of soil temperature and soil moisture on soil respiration rate have been enhanced to some extent. The results of this study can provide the basic data for soil and water conservation measures as a potential model for carbon sequestration in heavily soil erosion areas.