杉木采伐对集水区土壤热状况影响.pdf

39 5 Vol. 39, No . 5 2 0 0 3 9 SCIENTIA SILVAE SINICAE Sep. , 2 0 0 3 康文星 闫文德 ( 412006) : , , , THE EFFECT OF FOREST HARVEST ON THE SOIL THERMAL REGIME IN THE WATERSHED OF CHINESE FIR K ng Wenxing Y n Wende ( Research Section of Ecology , Central South Forestry University Zhuzhou412006) Abstract: The soil therm l regime nd the effect of forest h rvest in the w tershed were studied in virtue of therm l conductivity equ tion in soil nd physic l principle by 6 ye rs d t in Chinese Fir pl nt tion. The results showed th t the content of w ter in the soil determined the ch nge of the therm l c p city, therm l diffusivity nd therm l conductivity ccording to thetime in thew tershed. With the incre sing of soil therm l c p city, the percent of solid nd the decre sing of porosity, ll therm l f ctors incre sed. After forest h rvesting, the surf ce soil bec me more tighten bec use of the rtifici l strong disturbing. So the r tio of solid, liquid nd g s in the soil w s ch nged nd the soil therm l regimes were ch nged, especi lly the therm l diffusivity nd therm l conductivity in 0~ 5 cm depth soil incre sed more th n one times. The soil therm l regimes were ffected by the soil structure nd the soil components. But for the e ch f ctors of soil therm l regimes, the effect of e ch components w s different, especi lly to the inter ction of e ch components, which m de the therm l diffusivity nd therm l conductivity more complex. Therefore, it w s very difficult to ev lu te the effect of every soil structure nd every component. Key words: Soil therm l regimes, Volume therm l c p city, Therm l diffusivity, Therm l conductivity , , , ( ,