Dissertation > Agricultural Sciences > Forestry > Forestry basic science > Forest Hydrology

Hydrological Properties and Dynamics of Forest Reservoir of Main Forest Types in Fujian, China

Author YueYongJie
Tutor HeZongMing;YangYuSheng
School Fujian Agriculture and Forestry University
Course Soil and Water Conservation and Desertification Combating
Keywords forest reservoir soil reservoir capacity regulating water content waterstorage water holding capacity
CLC S715
Type Master's thesis
Year 2003
Downloads 104
Quotes 15
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Fujian Province is an area with many mountain areas, and the precipitation is great and concentrated in the summer rainy season with great intensity, which may be one of the cause of frequent floods. Forests as an adjuster for ecological balance in mountain areas play important roles in soil and water conservation, runoff and silt retardance etc. Especially, forests are regarded as " forest reservoir" due to their great hydrological regulation functions through canopy, undergrowth, litterfall and soil layers. Water capacities of various forests were different as diverse biological properties and forest structure. So there was significance for study on regulation function of forests. In this paper, properties and dynamics of various forest reservoirs were studied through two-year in situ observation located in Jianou. The results showed that:(1) Forest types could be divided into four groups based on water holding rate of canopy through clustering analysis of samples in order, viz. hard broadleaved>Chinese fir>soft broadleaved>pine and bamboo. Biomass and water holding capacity of undergrowth for major forest types in Fujian were 0.24~39.25 t-hm-2 and 0.40-30.35 t-hm-2 with the means of 7.65 and 5.63 t-hm-2 respectively. The corresponding mean values for forest floors were 6.98 t-hm-2 and 11.28 t-hm-2 respectively, and mean water holding rate of forest floors was 165.21%.(2) Total water storage on surface 40cm soil for various soil types in Fujian was between1608.80 t-hm-2 and 2379.60 t-hm-2 with mean of 2036.65 t-hm-2, of which 382.22 t-hm-2 was for non-capillary. Average initial and stable infiltration rates for different soils in forests in Fujian were 12.03 mnvmin-1 and 6.93mm-mm. respectively, with variance coefficients of 62.75% and 70.26 % respectively. There were extremely significant positive correlations between initial infiltration rates and organic matter contents (or non-capillary porosity) of surface soils (0~20cm), whereas extremely significant negative correlations between them were found. This relationship was also true for stable infiltration rates of soils.(3) Water holding capacity of canopy in Chinese fir forest in Fujian were 3.45 t-hm-2 at young-tree stage, 10.52 t-hm-2at fast-growth stage, 16.68 t-hm-2 at timber stage and5.12 t-hm-2 at mature stage respectively. While water holding capacity of undergrowth ranged from 0.43 to 36.22 t-hm-2, with mean of 4.40 t-hm-2. The corresponding values for forest floors were 0.936 t-hm-2, 5.56 t-hm-2, 8.22 t-hm-2 and12.47 t-hm-2 at stages of young-tree, fast-growth, timber and mature respectively.(4) Water holding capacities of over-growth and soil layers constitute that of the whole forests, which ranged from 1165.39 t-hm-2 and 2430.94 t-hm-2. Generally, natural forests had water holding capacity of over 2100 t-hm-2. Of total water holding capacity of forests, over-growth accounted for less than 5% commonly with the range of 4.06-112.51 t-hm-2, while maximum water holding capacity of top 40cm soils occupied more than 95% commonly.(5) Total water holding capacity of soils (0-100cm) in Castanopsis carlesii, Cinnamomum chekiangense, Schima superba, Citrus sp., Chinese fir and enclosing and tending forests were 545.42 mm, 545.23 mm, 503.94 mm, 474.10 mm, 471.62mm and 451.46mm, being 33.38%, 33.33%, 23.23%, 15.94%, 15.33% and 10.40% greater than that in the control (408.93 mm) respectively. The corresponding maximal available water holding capacity in soils of six forests was 1.82, 1.66, 1.59, 1.39, 1.56 and 1.43 times as much as that in the control respectively.(6) Mean annual water storage of soils in Schima superba, Chinese fir, Citrus sp. forests and the control was 386.66 mm, 374.235 mm, 304.75 mm and 240.24mm respectively. The annual patterns of water storage of soils in different forests were similar to "W" with high values from January to June and slow in September or October.(7) Water content that fluxed into soils after each rain could be regarded as regulating water content. Mean annual regulatin

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