黄土高原水蚀风蚀交错区不同立地条件下旱柳树干液流差异

Abstract

Abstract:

A thermal dissipation probe (TDP) was used to measure sap flow of Salix matsudana grown on slope land and dam land in the water-wind erosion crisscross region on the Loess Plateau. The environmental factors, such as soil water content and meteorological parameters, were measured synchronously to investigate the relationship between the sap flow and the environmental factors in the two sites. The results showed that the diurnal variations of S. matsudana sapflow velocity in the two sites were consistent, but the sapflow velocity and sap flow on the dam land were 1.4 times and 3 times higher than those on slope land. The variation pattern of sap flow in the two sites was consistent with the change in meteorological factors. The sap flow was influenced by meteorological factors markedly. The soil moisture of 0-50 cm layer was also one of main influence factors. In addition, the sap flow was mainly affected by soil moisture when the meteorological factors increased to a certain extent. The capability of soil evaporation and infiltration was quite different due to the different soil texture in the two sites. On slope land, the water holding capacity was lower, water was easy to leakage after rainfall, thus available moisture of rhizosphere was lower than those on dam land, and the S. matsudana was frequently subjected to drought stress and became "small old tree". By the contrast, S. matsudana grown on dam land grew well due to sufficient available moisture.

Key words: Salix matsudana, sapflow, thermal dissipation probe, climatic factors, soil water, Loess Plateau

CLC Number:

S715

Peng Xiaoping, Fan Jun, Mi Meixia, Xue Zhide. Sapflow Dynamic Changes of Salix matsudana in the Water-Wind Erosion Crisscross Region on the Loess Plateau[J]. Scientia Silvae Sinicae, 2013, 49(9): 38-45.

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Sapflow Dynamic Changes of Salix matsudana in the Water-Wind Erosion Crisscross Region on the Loess Plateau

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