[1]FANG Lu,LI Xiaoning,TANG Xiangjun,et al.Research on Water-holding Capacity and Related Factors in Zagunao River Basin in the Upper Reaches of Min River[J].Research of Soil and Water Conservation,2018,25(05):95-102.
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Research on Water-holding Capacity and Related Factors in Zagunao River Basin in the Upper Reaches of Min River
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
25
Number of periods:
2018 05
Page number:
95-102
Column:
Public date:
2018-09-06
- Title:
- Research on Water-holding Capacity and Related Factors in Zagunao River Basin in the Upper Reaches of Min River
- Keywords:
- upper research of Min River; timberline; soil water characteristic curve; specific water capacity; soil physical properties
- CLC:
- S152.7+1
- DOI:
- -
- Abstract:
- Under the special geographical environment of Zagunao River Basin in the Upper Reaches of Min River, the soil moisture has become a key factor limiting the plant growth and distribution of the timberline. Field experiments and laboratory experiments were conducted to study the soil water-holding capacity and physical properties of typical forest trees in Upper Reaches of the Min River, the Gardner experience equation was utilized to plot a soil water characteristic curve, and the soil water-holding capacity and the influencing factors were investigated. The results showed that:(1) the fitted parameter a value of typical soil reached up to 20; (2) in the same type of woodland, soil water holding capacities of natural forest and plantation in the shady slopes were all better than sunny slopes; and in the same slopes, soil water holding capacities of plantations were better than those of the natural forests; the soil water holding capacities of surface soil were better than the deeper layer (except for artificial forest in the sunny slops), which indicated that the water supply capacity of soil was affected greatly by the slope direction, and the vegetation type and soil depth have little influences; (3) silt content of the mountain forest soil of the upper reaches of the Min River forest soil was the highest, and the contents of clay size and sand contents were the least and middle, respectively; the soil sand content in shady slopes was higher than that of the sunny slope, and the silt content and clay contents were lower in sunny slope; the soil bulk density of forest increased with the increase of the altitude in the shady slope, and the soil bulk density increased first and then decreased with the increase of altitude in the sunny slope; the soil bulk density of the shady slope was significantly lower than that in sunny slope; the soil porosity structure was better than that of the sunny slope; (4) the soil water holding capacity of forest land was most significantly correlated with clay contents and non-capillary porosity and significant correlated with bulk density and capillary porosity, and the economic and ecological forests could improve the soil texture of large planting after the project of returning farmland to forest. Therefore, the soil moisture is the most important limiting factor in the process of local vegetation restoration. Vegetation restoration should be carried out step by step from the high altitude ecotone, and the purpose of vegetation restoration can be achieved ultimately in the difficult valley of the upper reaches of Min River.
- References:
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1900-01-01