刈割对植被组成及土壤有关性质的影响

Effect of cutting on vegetation composition and soil properties.

在红壤地区生长良好的自然植被(白茅)条件下设计了不同的刈割期试验,结果表明,每次刈割时的生物量以6年刈割1次处理最高,而以1年刈割1次处理最低,但6年累计生物量则以1年刈割1次处理最高,每块样地达399.1kg;各处理木本植物与草本植物生物量的比例亦与刈割期长短有关,至试验第6年时,6年刈割1次处理中木本植物生物量所占比例达41.5%,而每年刈割1次处理草本植物生物量占总生物量的99.0%;再次,刈割期的长短还影响土壤剖面的层次发育及有关理化性质的变化,6年刈割1次处理土壤容重较小,有机质和N、P、K含量较高,而1年刈割1次处理则土壤容重较大,有机质和N、P。

Different cutting experiments were executed on well grown natural Imperata cylindrica vegetation in red soil region.The biomass of every 6 years cutting was the highest,and the annual cut was the lowest.Annual cutting resulted in the highest total accumulative biomass in 6 years,with a total production of 399.1kg per plot.The species composition was also influenced by the length of cutting period.In the 6th year of experiment,the xylophyta biomass in the treatment of every 6 years cutting accounted for 41.5% of the total biomass,while the herb biomass in the treatment of annual cutting was 99.0% of the total.The length of cutting period also influenced the layer's development of soil profile and the physicochemical properties of soil.In comparing with the treatment of annual cutting, the soil bulk density in the treatment of every 6 years cutting was lower,and the contents of soil organic matter,total nitrogen,available phosphorus and available potassium were higher.