【摘要】 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。更多还原

【Abstract】 Based on observation data of soil water,temperature,plants growing vigor,and soil respiration rates of Populus euphratica community at Kardayi and Alagan sections in lower reaches of the Tarim River under different overshadow treatments,we analyzed influence of growing vigor of Populus euphratica forest on soil respiration rate and influence of photosynthesis on soil respiration rate.Results showed that there were several peak values in daily change of soil respiration rates of Populus euphratica community,and the peak values mainly appeared during 12:00-16:00;the valley values appeared at 08:00 or 20:00.The growing vigor of Populus euphratica forest influences the soil respiration rate to a great degree.The relationship between soil respiration rates of Populus euphratica community and soil water content and temperature was not significant,but was directly controlled by amount of assimilation product.更多还原