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本研究对鄂尔多斯高原沙化灌丛群落油蒿土壤呼吸日变化和季节变化进行了野外定位观测,并对其环境驱动因子进行了初步的探讨。结果表明:油蒿群落两个不同生长期土壤呼吸日变化及其对温度因子的响应存在差异。营养生长期,土壤呼吸日变化不明显,且土壤呼吸速率和温度日变化无显著的相关关系;而在生殖生长期,土壤呼吸日变化非常明显,气温及0-10cm土壤温度日变化与土壤呼吸速率相关显著(P<0.05)。整个生长季期间,土壤呼吸高峰期出现在7-8月,与该段时间水热因子条件最佳且配置较好密切相关。荒漠灌丛生态系统中,降雨是土壤呼吸出现激发现象的控制因素。降雨对土壤产生的干湿交替作用能够显著提高土壤呼吸速率。生长季期间,土壤呼吸速率变化与气温及0-10cm土壤含水量变化的相关性显著(P<0.05)。通过逐步回归发现,0-10cm土壤含水量的变化能够说明生长季土壤呼吸速率变化的41.9%(P<0.05)。图3表2参34。
In this study, the daily field observations of diurnal changes of soil respiration and seasonal changes of Artemisia ordosica communities in the desert shrub community in the Ordos Plateau were conducted and their environmental drivers were discussed. The results showed that there was a difference in diurnal variation of soil respiration and its response to temperature factors in two different growth stages of Artemisia ordosica community. In vegetative growth period, soil respiration had no obvious change, and there was no significant correlation between soil respiration rate and diurnal variation of soil temperature. In reproductive growth period, the diurnal variation of soil respiration was very obvious. The diurnal variation of temperature and 0-10 cm soil temperature and soil respiration The rate was significant (P <0.05). During the whole growing season, soil respiration peaked from July to August, which was closely related to the best and better configuration of hydrothermal factors during this period. In desert shrub ecosystems, rainfall is the controlling factor of soil respiration. Alternation of wet and dry rainfall on soil can significantly increase soil respiration rate. During the growing season, the correlation between soil respiration rate and temperature and 0-10 cm soil water content was significant (P <0.05). The results of stepwise regression showed that the change of soil water content in 0-10 cm soil layer could indicate the change of soil respiration rate in growing season (41.9%, P <0.05). Figure 3 Table 2 Reference 34.