石羊河下游人工梭梭林土壤呼吸变化特征及其与水热因子的关系

doi:10.12118/j.issn.1000-6060.2019.03.13

Abstract

Abstract: Soil respiration is not only one of important indexes of soil biological activity but also a hot issue in the studies of global carbon cycle.In order to reveal the characters of the soil respiration of an artificial Haloxylon ammodendron forest at its different life stages (40 a, 30 a,10 a and 5 a) in the lower reaches of Shiyang River,Gansu Province,China which is located in the typical arid region,the LI-8 100 automated soil CO2 flux system was used to investigate the daily change of the soil respiration of the forest in both growing and nongrowing seasons,with the mobile sand dunes and the artificial Haloxylon ammodendron forest after soil crust removal as the control samples.The influence of soil moisture and temperature on its respiration was also evaluated.The four results were found as follows: (1) Diurnal changes in the soil respiration rate of the artificial Haloxylon ammodendron forest at different life stages in both growing and nongrowing seasons were showing an obvious singlepeak curves with certain volatility.The maximum rate appeared from 12:00 PM to 14:00 PM while the minimum around 8:00 AM.(2) Planting Haloxylon ammodendron forest and breaking soil crusts significantly improved the respiration rate of the desert soil and the respiration rates of the forest in different life stages generally were progressively increased with the planting age,following a descent order as MC= >40 a>30 a>10 a>MS >5 a in the growing season and MC>40 a>10 a>5a>30 a>MS in the nongrowing season respectively. (3) There are obvious seasonal variations in the soil respiration rate of the artificial TBX]Haloxylon ammodendron forest at different life stages.The value of the rate in the growing season (August) is much higher than that in the nongrowing season (January). (4) The correlation analysis showed that the soil respiration rate (Y ) of artificial Haloxylon ammodendron forest was significantly correlated with the soil water content (X ) at the depth from 0 to 5cm in both growing and nongrowing seasons.Their relationships were described by the following square curve regression equations: Y=-0.205 8X²+0.946 5X-0.316 6 (R²=0.506 2,P=0.041 7) for the growing season and Y=0.118 7X²+0.156 3X+0.118 8 (R²=0.675 7,P =0.001 1） in the nongrowing season,respectively.However,there were no significant correlations between soil respiration rate and soil temperature at 10 cm depth.Thus,the soil water content is the critical factor for soil respiration of artificial Haloxylon ammodendron forest.The findings further proved the importance of planting Haloxylon ammodendron forest to promote the biological activity and carbon flux in the desert soil.Nevertheless,degradation of artificial Haloxylon ammodendron forest and land desertification reflected by the destructed soil crusts will inevitably increase carbon emission in the short run.Therefore,artificial afforestation in desert areas and soil crust protection in this process as well as effective forest administration should be adopted to reduce CO² emissions.

Key words: artificial Haloxylon ammodendron forest, soil respiration, lower reaches of Shiyang River, diurnal variation

WANG Xinyou MA Quanlin, JIN Hujia, FAN Baoli, ZHANG Jinhu, LIN Huilong.

Soil respiration variation characteristics and its relationship withhydrothermic factor of artificial Haloxylon ammodendron forest in lower reaches of Shiyang River [J].Arid Land Geography, 2019, 42(3): 570-580.

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Soil respiration variation characteristics and its relationship withhydrothermic factor of artificial Haloxylon ammodendron forest in lower reaches of Shiyang River

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