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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Soil respiration under different forest species in the riparian buffer of the semi-arid region of northwest India
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Soil respiration under different forest species in the riparian buffer of the semi-arid region of northwest India

机译：印度西北半干旱地区河岸缓冲带不同森林物种下的土壤呼吸

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摘要

Soil temperature and soil moisture are the most important environmental factors controlling soil respiration (SR) in ecosystems. However, SR and associated edaphic factors have not been widely studied in semi-arid regions. In this study, SR was measured in a riparian zone and the effect of soil temperature and soil moisture on SR was examined under five forest species of the semi-arid region. The mean daily SR rate was 1.82, 2.08, 2.35, 2.27 and 2.07 g C m(-2) d(-1) in Jatropha curcas, Leucaena leucocephala, Acacia nilotica, Azadirachta indica and Prosopis juliflora sites respectively. It was found that SR was significantly and positively correlated with soil moisture. A univariate model of sub-surface soil moisture could explain 77% of temporal variation in soil CO2 efflux, irrespective of species and sites. The logarithmic model could best explain the relationship between SR and soil moisture at 10-20 cm of soil depth (P < 0.001). There were negative correlations between SR and soil temperature under majority of species. Overall, across all species, soil temperature poorly explained 26% variation in SR as independent variable. For SR rate-temperature relationship, a bell-shaped function gave the best fit in this ecosystem. Under all the species, SR increases with increase in soil temperature up to 33 degrees C (+/- 2); thereafter it decreases gradually under all species. There was strong evidence that deficit of soil moisture rather than soil temperature was the main regulating factor of SR under the semi-arid ecosystems.
机译：土壤温度和土壤水分是控制生态系统中土壤呼吸（SR）的最重要环境​​因素。但是，在半干旱地区，SR和相关的蒸发因子尚未得到广泛研究。在这项研究中，在河岸带测量了SR，并在半干旱地区的五种森林物种下研究了土壤温度和土壤水分对SR的影响。在麻疯树，银合欢，印度洋相思树，印度印za和朱Pro Prosopis juliflora站点中，平均每日SR率分别为1.82、2.08、2.35、2.27和2.07 g C m（-2）d（-1）。发现SR与土壤水分显着正相关。地下土壤水分的单变量模型可以解释77％的土壤CO2外排时间变化，而不论物种和地点如何。对数模型可以最好地解释土壤深度10-20 cm时SR与土壤水分之间的关​​系（P <0.001）。在大多数物种下，SR与土壤温度呈负相关。总体而言，在所有物种中，土壤温度均不能很好地解释SR作为自变量的26％变化。对于SR速率与温度的关系，钟形函数最适合该生态系统。在所有物种下，SR随土壤温度的升高而升高，最高至33摄氏度（+/- 2）;此后，它在所有物种下逐渐减少。有强有力的证据表明，在半干旱生态系统下，土壤水分而非土壤温度的缺乏是SR的主要调控因素。

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