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结合干旱环境下塔里木河下游地区胡杨群落长势、土壤呼吸、土壤水分、温度的实时监测资料,通过改变光热条件对胡杨群落进行人工遮阴控制,分析植物群落长势对土壤呼吸速率的影响,同时对不同光环境下胡杨群落土壤呼吸速率变化特征及其影响因素进行了探讨。结果表明,胡杨群落土壤呼吸速率日变化呈现多峰值曲线,但最大值集中出现在12:00—16:00之间,最低值出现在早上08:00和晚上20:00;植物群落长势很大程度上决定着土壤呼吸速率的大小;胡杨群落土壤呼吸的日变化与水热因子之间联系存在很大的不确定性,但在很大程度上受植物新近合成同化产物控制。
Combining the real-time monitoring data of Populus euphratica community growth, soil respiration, soil moisture and temperature in the lower reaches of the Tarim River in arid environment, the effects of plant community on the soil respiration rate were analyzed by changing the light and heat conditions. The characteristics and influencing factors of soil respiration rate in Populus euphratica under different light environments were discussed. The results showed that the diurnal variation of soil respiration rate in Populus euphratica community showed a multi-peak curve, but the maximum appeared in the range of 12: 00-16: 00, the lowest occurred in 08: 00 in the morning and 20: 00 in the evening. The degree of soil respiration rate determines the size of Populus euphratica community soil respiration diurnal variation and hydrothermal factors there is a great deal of uncertainty, but to a large extent by the plant recently controlled by synthetic products.