Appropriate density of water and soil conservation of and forests in loess area, North China

Abstract

In this paper, based on a long-term monitoring of water cycle in the water and soil conservation forest stands of Pinus tabulaeformis and Robinia pseudoacacia, the soil moisture deficit is calculated. Following the principles of runoff-collecting forestry and applying the forest structure investigation results, the authors developed a formula to calculate appropriate density for forests on the basis of different diameters at breast height (DBH). Using this method to manage forests, the natural water requirement of forests can be met and soil drought can be avoided. In addition, with long-term monitoring of soil moisture in stands, the authors also give an appropriate managing density specifically for the water and soil conservation forests of P. tabulaeformis and R. pseudoacacia in the loess area which is according to soil moisture content, or with the lowest soil moisture content and invalid moisture frequency as the indexes.

References

1. Bian Y N 1996 Probe into reasonable density of Robinia pseudoacacia forest in semi-arid area of eastGansu ProvinceSoil Water Conserv China32224 (in Chinese)
2. Bian Y N 1994 Study of rational planting density of Robinia pseudoacacia in the gullied rolling Loess regionin East GansuSoil Water Conserv China93235 (in Chinese)
3. Li S R Zhang W Q He K N 2003 Soil moisture dynamic of the Robinia pseudoacacia with different densityin semiarid region on the Loess PlateausSci Soil Water Conserv1(2)2832 (in Chinese)
4. Sun X H Wu X Y Liu G 2004 Study on reasonable density of afforestationin sand areaProtect For Sci Technol58(1)6364 (in Chinese)
5. Wang L Shao M A Li Y Y 2004 Study on relationship between growth ofartificial Robinia pseudoacacia plantation and soil desiccation in the Loess Plateau of NorthernShannxi ProvinceSci Silv Sin40(1)8491 (in Chinese)
6. Xu B C Shan L Chen Y M 2003 Review and discuss on the effect and influencefactors of vegetation construction on soil water in semi-arid areaon Loess PlateauSci Soil Water Conserv1(4)3235 (in Chinese)
7. Yang Y H Zhao S W Liu N N Wu J S Su J Xu J 2006 Soil moisture characteristics of different vegetation measures inloess hilly region of southern NingxiaSciSoil Water Conserv4(2)2428 (in Chinese)
8. Yu X X Zhang J J 1996 Analysis andassessment of soil moisture in forests ecology system in loess areaSci Silv Sin32(4)2533 (in Chinese)
9. Yu X X 1995 Dynamic Soil HydrologyBeijingChina Forestry Publishing House (in Chinese)
10. Zhang J J Bi H X Wei T X 2002 Functions of soil and water conservationof forest stands with different densities in loess area in westernShanxi, ChinaJ Beijing For Univ24(3)5053 (in Chinese)
11. Zhang Y T Yang J H 2003 Study on fittingafforestation density of Platycladus orientalis under environmental capacity of precipitation resource on LoessPlateauJ Soil Water Conserv17(2)156162 (in Chinese)