Research on slope vegetation method for Shirasu soil erosion

(1)宫崎市无纺布覆盖坡面土壤侵蚀及植被状况1995年全年降水量2170 mm，较常年偏少，夏季气温较高，再创历史新高。因此，植被过度生长。裸露坡面土壤流失量为93.43t/ha/年，非织造布坡面土壤流失量为零。今年试验结果的特点是灌木三叶草的植被显著，Peneross科植物对非织造布(无种子)地的入侵也很显著。(2)实际旱地试验坡地的植被状况大野町Hae 1、2号侵蚀试验地的坡面生长旺盛，在4年期满后的今年10月，灌木三叶草生长旺盛，特别是2年后灌木三叶草的粗长显著。HAE2号样地的草坪坡和植被网坡(1m宽)的植被状况不同程度地差，但稳定性…对坡面侵蚀影响不大。在HAE 4号样地简易植被网上放置无纺布的试验坡面上，无纺布对植被的影响较大。在位于清武町Shirasu区的TOKIYA 2号、3号样地，植被在大约3年后基本稳定。(3)生物量C、N和细菌数量的测定结果表明，宫崎市无纺布覆盖的根际土壤样品中生物量C、N、全C、N的含量增加较多，尤其是含种子的生物量C、全C和全C的增加幅度较大。生物量C与总C、生物量N与全N分别具有较高的正相关性，同时还必须考虑气象条件对微生物的影响。较少

(1)SOIL EROSION AND VEGETATION AT SLOPE COVERED BY NON-WOVEN FABRIC IN SHIRASU EROSION TEST PLOT,MIYAZAKI UNIV.CAMPUSIn 1995, annual precipitation was 2170 mm that is less compared with that of average year, and temperature in summer was high as renewing high record. So, vegetation was over growing. Soil loss from bare slope was 93.43 t/ha/year and nothing from non-woven fabric slope. Features of test results in this year were that vegetation of bush clover was remarkable and an invasion of Peneross family plant to the non woven fabric (no seeds) plot was also remarkable.(2)VEGETATIVE STATES AT TEST SLOPES IN ACTUAL UPLAND FIELDSVegetatin of slope for erosion test plots at HAE No.1, No.2 in Tano cho was so vigorous as over growing at this October in the stage of 4 year expiration, especially thick growing of bush clover has been remarkable about 2 years after. Vegetation was inferior to some degree at straw turf slope and vegetation net slope (1 m width) in HAE No.2 plot, but stability … More for slope erosion was not much influenced. At test slope where non-woven fabric was put on the simple vegetation net in HAE No.4 plot, effect of non-woven fabric for vegetation was much. At TOKIYA No.2, No.3 plots situated in Shirasu district of kiyotake cho, vegetation was generally stable about 3 years after. In the lower part of slope of former plot, there are some imperfect vegetation slope, so continuous observation willbe necessary.(3)MEASUREMENT OF BIOMASS C,N AND NUMBER OF BACTERIA AND FUNGIIt cleared that Biomass C,N total C and N obtained from soil samples of root zone covered by Non-woven fabric at MIYAZAKI UNIV.test plot increase in quantity, especially biomass C and total C were more in case of seeds containing.In case of test fields HAE and TOKIYA, the measurements have been started from the biginning of 1994 and biomass in non-woven fabric slopes have progressed every year, especially biomass C progressed remarkablly. Biomass C to total C and biomass N to total N had high plus correlation respectively and also influence of microorganism by meteorological condition must be considered. Less