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Citation:

Effects of Rainfall on Soil Temperature, Moisture and Water Movement of Platycladus orientalis on Rocky Hills of North China

  • Received Date: 2014-12-05
  • By using stable isotope techniques, the Platycladus orientalis grown on the rocky hilly area of North China were chosen to investigate air temperature, soil temperature, moisture and δD value in order to discuss the effect of seasonal rainfall on soil temperature, moisture and water movement. The results indicated that: the soil temperature following rainfal decreased first and then increased in the rainy season, and decreased with the increases of depths, whereas in the early dry season the temperature continued to decrease but increased with the depth. No matter in the rain or dry season, the soil moisture increased at first and then decreased after the rain, but dropped with the depth of soil. In rain season, when the early soil moisture was low, the low intensity rainfall could further increase the moisture of surface and deep soil and made the water δD value deplete, which showed rainfall could recharge the surface and middle soil. However, in prior plentiful rainfall period, low intensity rainfall could further increased the deep soil moisture, and all the soil water δD value were depleted, which indicated that rainfall could rapidly infiltrate into the deep soil. High intensity rainfall increased all the soil moisture and the increments had small differences, meanwhile all the water δD value were depleted, which showed that rainfall could quickly infiltrate into all the soil. In the early dry season, low intensity rainfall may further increase the surface soil moisture. Even if the prior soil moisture were low, the soil water δD value were all depleted, which pointed that rainfall could rapidly infiltrate into the deep soil and further recharged groundwater. Directly affected by rainfall δD value, the litter water δD value were depleted at first and then enriched. The δD value of spring and groundwater were not affected by short-term rainfall, so they could supply water for plant in the dry season.
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Effects of Rainfall on Soil Temperature, Moisture and Water Movement of Platycladus orientalis on Rocky Hills of North China

  • 1. State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
  • 2. Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing Jiangsu 210037, China
  • 3. Dagou-he National Forest Farm, Jiyuan Henan 454650, China

Abstract: By using stable isotope techniques, the Platycladus orientalis grown on the rocky hilly area of North China were chosen to investigate air temperature, soil temperature, moisture and δD value in order to discuss the effect of seasonal rainfall on soil temperature, moisture and water movement. The results indicated that: the soil temperature following rainfal decreased first and then increased in the rainy season, and decreased with the increases of depths, whereas in the early dry season the temperature continued to decrease but increased with the depth. No matter in the rain or dry season, the soil moisture increased at first and then decreased after the rain, but dropped with the depth of soil. In rain season, when the early soil moisture was low, the low intensity rainfall could further increase the moisture of surface and deep soil and made the water δD value deplete, which showed rainfall could recharge the surface and middle soil. However, in prior plentiful rainfall period, low intensity rainfall could further increased the deep soil moisture, and all the soil water δD value were depleted, which indicated that rainfall could rapidly infiltrate into the deep soil. High intensity rainfall increased all the soil moisture and the increments had small differences, meanwhile all the water δD value were depleted, which showed that rainfall could quickly infiltrate into all the soil. In the early dry season, low intensity rainfall may further increase the surface soil moisture. Even if the prior soil moisture were low, the soil water δD value were all depleted, which pointed that rainfall could rapidly infiltrate into the deep soil and further recharged groundwater. Directly affected by rainfall δD value, the litter water δD value were depleted at first and then enriched. The δD value of spring and groundwater were not affected by short-term rainfall, so they could supply water for plant in the dry season.

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