论文部分内容阅读
土壤肥力质量是影响泥石流滩地土地利用和生态恢复的重要因素,为探究时间序列上泥石流滩地土壤肥力质量的演变趋势,采用嵌套设计方法选择近期(0-10年)、中期(10-20年)和早期(>20年)泥石流滩地为处理样地,同时以近期泥石流堆积滩地作为对照样地,通过测定不同滩地的林地、耕地、草地和荒地土壤理化性质和土壤酶活性(共16种指标),并利用土壤肥力质量综合指数法对不同堆积时期滩地的各类土地利用方式土壤肥力质量进行研究.结果显示:堆积时期和土地利用类型不同促使泥石流滩地土壤理化性质和土壤酶活性产生差异,土壤肥力质量综合指数表现出早期堆积滩地(0.54)>中期堆积滩地(0.53)>近期堆积滩地(0.31)的特征;近、中、早期滩地不同土地利用方式下土壤肥力质量评分均以耕地(46、82、83)和林地(47、79、75)最高,草地(26、42、41)次之,荒地(03、10、15)最低,且林地土壤肥力质量表现出退化的趋势.本研究表明,随堆积时间增长,泥石流滩地土壤肥力质量提高,其变化速率先快后慢,但不合理的栽植和耕种可能导致泥石流滩地土壤肥力质量退化.因此,加强土地利用方式优化和实施养分归还等对于泥石流滩地的持续利用和生态恢复具有重要意义.图2表6参37
Soil fertility quality is an important factor affecting the land use and ecological restoration in the debris flow beach. In order to explore the evolution trend of soil fertility quality in the debris flow beach, a nested design method was used to select the recent (0-10 years), mid-term (10-20 years) ) And early (> 20 years) debris flow beachland for the treatment of plots, and the recent debris flow accumulation beach as a control sample, by measuring the different beach land of woodland, arable land, grassland and wasteland soil physical and chemical properties and soil enzyme activity (a total of 16 indicators ) And the soil fertility quality integrated index method was used to study the soil fertility quality of different types of land use in different landfills during the accumulation period.The results showed that there were differences in soil physical and chemical properties and soil enzyme activities in the debris flow beach when the accumulation period and land use types were different, The index of soil fertility quality showed the characteristics of early accumulation land (0.54), mid-term accumulation land (0.53) and recent accumulation land (0.31). The soil fertility quality scores of different types of land use in the near, , 82,83) and woodland (47,79,75), followed by grassland (26,42,41) and wasteland (03,10,15) The soil fertility showed a trend of degradation.The study shows that with the increase of deposition time, the quality of soil fertility in debris flow beach improves rapidly and slowly, but unreasonable planting and cultivation may lead to the degradation of soil fertility quality in the debris flow beach. Therefore, it is of great importance to strengthen the sustainable utilization and ecological restoration of debris flow beach by optimizing land use patterns and implementing nutrient return.