Paper Infomation
Dynamic Characteristics of Soil Water Potential in Larch Forest in Growing Season
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Author: Yuan Tian, Qiuliang Zhang, Te Ba, Yanhua Kuang
Abstract: Larch (Larix gmelini Rupr.) are widely distributed in the Greater Khingan Mountains. Its growth and development are closely related to soil water. By the determination of soil water potential of different depths, I studied the monthly variations and diurnal variations of soil water potential in larch forest. The results of the experiment indicate that the mean value of soil water potential decreased with the increase of depth. The soil water potential of the depth of 20cm and 80cm changes in a large extent, the depth of 40cm and 60cm changes more gently. The 60cm soil water potential values can reflect the soil water potential values in the forest. The soil water potential values are fitted with cubic functions. During the growing season, the soil water potential of the depth of 20cm has downward trend all the time, others show a rapid rise is followed by a gentle downward trend. It is the soil water accumulation period from May to June. In this period, the soil water potential increased with time and decreased with the increase of depths. It is the soil water consumption period from July to October. In this period, the soil water potential decreased with time and increased with the increase of depth. The precipitation and the soil temperature affect the soil water potential. Daily change characteristics of soil water potential of depths from 20cm to 80cm are identical except for the depth of 20cm in May. In July and October, features of the depth of 80cm are different from others. Extreme values of the soil water potential are usually appearing about 7 o 'clock and 9 o 'clock in a day.
Keywords: The Greater Khingan Mountains; Larix gmelini Rupr.; Soil Water Potential; Monthly Variation; Daily Variation
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