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Citation:

Effects of Thinning on the Soil Moisture of the Picea crassifolia Plantation in Qilian Mountains

  • Received Date: 2014-05-20
  • In sample area scale, the soil moisture of Thickleaf Spruce (Picea crassifolia) natural forest and the plantations with no thinning and thinned in 20% intensity in the Qilian Mountains were studied during the growing season by EM50 soil moisture monitors to analysis the effects of thinning on plantation soil moisture. The results showed that the surface (10 cm) soil moisture content of unthinned plantation was significantly higher than that of the plantations thinned in 20% intensity and the natural forests. It is proved that thinning led to the decline of surface soil moisture of plantations. But the intermediate thinning significantly increased the soil moisture content at the depth of 60 cm. Compared with the soil water content of natural forest land, the soil volumetric water contents in the depth of 60 cm and 80 cm of unthinned plantation were only 49.7% and 52.1% that of natural forests during the growing season. Aridification was found in deep soil layer of plantation, but it can be mitigated and slow down by intermediate thinning.
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Effects of Thinning on the Soil Moisture of the Picea crassifolia Plantation in Qilian Mountains

  • 1. Linze Inland River Basin Research Station, Key Laboratory of Inland River Basin Science, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China
  • 2. University of Chinese Academy of Sciences, Beijing 100049, China

Abstract: In sample area scale, the soil moisture of Thickleaf Spruce (Picea crassifolia) natural forest and the plantations with no thinning and thinned in 20% intensity in the Qilian Mountains were studied during the growing season by EM50 soil moisture monitors to analysis the effects of thinning on plantation soil moisture. The results showed that the surface (10 cm) soil moisture content of unthinned plantation was significantly higher than that of the plantations thinned in 20% intensity and the natural forests. It is proved that thinning led to the decline of surface soil moisture of plantations. But the intermediate thinning significantly increased the soil moisture content at the depth of 60 cm. Compared with the soil water content of natural forest land, the soil volumetric water contents in the depth of 60 cm and 80 cm of unthinned plantation were only 49.7% and 52.1% that of natural forests during the growing season. Aridification was found in deep soil layer of plantation, but it can be mitigated and slow down by intermediate thinning.

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