Font Size: a A A

Characteristics Of Soil And Water Loss Under Different Forest Types In Hilly Red Soil Region Of Southern China

Posted on:2007-03-08Degree:MasterType:Thesis
Country:ChinaCandidate:Z G HuangFull Text:PDF
GTID:2133360185963049Subject:Crop Cultivation and Farming System
Abstract/Summary:PDF Full Text Request
Hilly red soil region of southern China is a region whose cultivation index is highest in southern China, but contemporary its soil and water loss is most severe. So it will have markedly significant realistic meanings to the restoration practice of degraded ecosystems and the duration development of soc-economy that study on the characteristics of soil and water loss under different forest types in hilly red soil region of southern China. In the studies, six different forest types were approached through runoff section test in the above forest types in the catchment of liangxi village, Cili County of Hunan Province. They were Broadleaf forest (BLF), Pinus massoniana plantation (PMP), Shrubbery (SBB), Eucommia ulmoides plantation (EUP), Verica foddi plantation (VFP) and deserted land (CK). Results showed as follows:Erosive precipitation primarily was rainstorm and big rainstorm distributed in Apr. to Aug. in study stage, which accounted for 59.0% of total precipitation times and 73.4% total erosive precipitation. There were remarkable significant (P<0.01) between rain erosivity (R30) and erosive precipitation and maximal rain intensity of 30 min. (I30), whose correlation coefficient were 0.844 and 0.609 respectively.The variation trend of runoff and sediment among different forest types was VEP> CK> PMP> EUP> BLF> SBB, and they mainly distributed in Apr. to Aug. in study stage, which accounted for 88.4% of total runoff and 71.7% total sediment. The annual average runoff and sediment loss were 66.3 mm and 9.5kg/km~2 respectively. Compared with CK, runoff produced in SBB, BLF, EUP and PMP were reduced by 1688.7%, 427.8%, 130.2%和 88.7% respectively, as well as sediment were 400.7%, 126.8%, 40.1 %和16.3% respectively. But the reverse was true to VFP, which increased 11.7% and 51.5%. So, we could draw some conclusions that SBB and BLF...
Keywords/Search Tags:Hilly red soil region of southern China, Forest type, Soil and water loss, Rain erosivity, soil water storage
PDF Full Text Request
Related items