CAJ | 학술논문

通过处理(根据当地习惯收割凋落物和林下层)和保护(无任何人为干扰)样地的比较试验,1990～1995年期间研究了人为干扰对鼎湖山生物圈保护区马尾松(Pinus massoniana)林土壤细根和有机质的影响.在此5a的研究期间,由于人为干扰活动而直接从处理样地取走的林下层和凋落物总量为21.7 t/hm2.在保护样地,林下层生物量从2.2 t/hm2增加至11.10 t/hm2,地表凋落物(包括枯死的林下层)量则从3.0 t/hm2增加至13.3 t/hm2.收割林下层和凋落物这种人为干扰活动对林地土壤细根生物量的影响不明显,但却显著降低土壤轻腐殖质(Soil light organic matter)量.在细根分解过程中,其分解速率在处理样地(试验结束时细根残存量占起始量的40.8%)显著高于在保护样地(试验结束时细根残存量占起始量的44.3%);与Ca、Mg和K元素不同,N和P两种元素的释放速率在处理样地显著高于保护样地,表明这种人为干扰活动不仅直接取走所收割的林下层和凋落物中的养分,而且还可能增加林地有效养分的流失潜力.
통과처리(근거당지습관수할조락물화림하층)화보호(무임하인위간우)양지적비교시험,1990～1995년기간연구료인위간우대정호산생물권보호구마미송(Pinus massoniana)림토양세근화유궤질적영향.재차5a적연구기간,유우인위간우활동이직접종처리양지취주적림하층화조락물총량위21.7 t/hm2.재보호양지,림하층생물량종2.2 t/hm2증가지11.10 t/hm2,지표조락물(포괄고사적림하층)량칙종3.0 t/hm2증가지13.3 t/hm2.수할림하층화조락물저충인위간우활동대임지토양세근생물량적영향불명현,단각현저강저토양경부식질(Soil light organic matter)량.재세근분해과정중,기분해속솔재처리양지(시험결속시세근잔존량점기시량적40.8%)현저고우재보호양지(시험결속시세근잔존량점기시량적44.3%);여Ca、Mg화K원소불동,N화P량충원소적석방속솔재처리양지현저고우보호양지,표명저충인위간우활동불부직접취주소수할적림하층화조락물중적양분,이차환가능증가임지유효양분적류실잠력.
Effects of human impacts on fine roots and soil organic matter of a pine forest in subtropical China were studied by comparing treatment (harvesting understory and litter according to practice of local people) and control (no harvest) plots in a pine forest from 1990 to 1995. During this studied period, the total amount of material harvested by this practice in treatment plots was 21.7 t/hm2. In control plots, the standing stocks of understory increased from 2.2 to 11.1 t/hm2 at a significantly linear pattern, while the standing stocks of litter (including dead understory) increased from 3.0 to 13.3 t/hm2. Harvesting practice had no significant effect on the standing fine root biomass, but significantly reduced soil light organic matter in pine forest. Mass loss in decomposing fine roots was linear in both control and treatment plots. Fine roots decomposed significantly faster in treatment (40.8 percent of initial mass remaining at the end of the 448 day experiment) than in control plots (44.3%). Nutrient losses from decomposing fine roots were significantly faster in treatment plots than in control plots for N and P, but there were no significant difference for other elements. These trends indicated that there could be a higher potential for nutrient loss by harvesting understory and litter (more nutrients available for understory uptake and litter mobilizing N during early stage of decomposition) and by leaching in treatment plots.