摘要
以探明不同土地利用方式对土壤团聚体的影响为目的,为提高山地丘陵区空心村整治还田土壤稳定性及生产性能提供科学依据。在陕西澄县山地丘陵区空心村整治还田后,设置5种不同的土地利用方式,开展为期1年的种植试验,分别为玉米(C处理)、小麦(W处理)、蔬菜(V处理)、药材(M处理)及对照(未种:CK处理)。测定分析干筛法和湿筛法0—40cm土层土壤团聚体分布、平均质量直径(WMD)、几何平均直径(GMD)、团聚体破坏率(PAD)、不稳定团粒数(ELT)和分形维数(D)。结果表明:(1)各处理在0—40cm各土层土壤团聚体数量及大小均显著优于CK处理,各处理干筛下0—40cm土层>0.25mm团聚体含量(DR0.25)和湿筛下该含量(WR0.25)随着土壤土层深度的增加呈现相反的趋势;(2)干筛法和湿筛法0—40cm土层各处理土壤平均重量直径(MWD)平均值和几何平均直径(GMD)平均值大小顺序均呈现W处理>C处理>M处理>V处理>CK处理,C处理有助于增加表层土壤大团聚体含量,W处理则有助于增加下层土壤大团聚体含量;(3)湿筛法分析表明,各处理土壤团聚体破坏率(PAD)和不稳定团粒指数(ELT)在0—40cm土层内均表现出近似"Z"字形趋势,各处理显著低于CK;(4)各处理的分形维数(D)在0—40cm土层平均值大小顺序为C处理<W处理<M处理<V处理<CK处理。土壤分形维数(D)与干筛法和湿筛法下0—40cm土层>0.25mm团聚体含量之间存在良好的线性关系,分别为R2=0.74和R2=0.67。空心村整治还田后种植玉米和小麦有利于提高0—40cm土层大团聚体含量,增加土层稳定性,改善土壤结构。
To reveal the influence of the different ways of land use on soil aggregate, return the vacancy village renovation to improve the hilly area of soil stability and provide a scientific basis for production performance. After vacancy village renovation in hilly area of Chengeheng County in Shaanxi Province, five different ways of land use were set up, a period of one year of planting experiment, of corn （C）, wheat （W）, vegetables （V）, medicinal herbs （M） and control （CK treatment） was conducted. Wet sieve method and dry sieve of 0-40 cm soil layer soil aggregate distribution, average quality diameter （WMD） and geometric mean diame- ter （GMD）, aggregate damage rate （PAD）, the number of unstable crumb （ELT） and fractal dimension （D） were analyzed. The results showed that： （1） soil aggregate quantity and size in each processing in 0--40 cm soil layer were significantly better than those of CK treatment, dry sieve 〉0. 25 mm （DR0.25） and wet- screened aggregate content （WR0.2s） with the increase of soil depth in 0--40 cm soil layer under various pro- cessing presented opposite trends; （2） soil mean weight diameters （MWD） and geometric mean diameters （GMD） measured by dry sieve and wet sieve method sin 0--40 cm soil layer of each treatment decreased in the order： W〉C〉M〉V〉CK, C treatment was conducive to increasing the aggregate content of surface soil, W treatment helps to increase the lower soil aggregate content; （3） wet sieve analysis showed that the soil aggregate unstable failure rate （PAD） and aggregate index （ELT） in 0-40 cm soil layer under each treat- ment showed ＇Z＇ shape, each treatment was significantly lower than CK; （4） average fractal dimension （D） in 0--40 cm soil layer of each treatment increased in the order： C〈W〈M〈V〈CK. there is a good linear relationship between soil fraetal dimension （D） andS0.25 mm aggregate contents determined by dry sieve method and wet sieve method in 0--40 cm soil
出处
《水土保持研究》
CSCD
北大核心
2017年第4期174-181,共8页
Research of Soil and Water Conservation
基金
陕西省重点科技创新团队计划项目"退化及未利用土地整治"(2016KCT-23)
关键词
空心村
土壤团聚体
平均质量直径
几何平均直径
分形维数
vacancy village
soil aggregate
mean weight diameters（MWD）
geometric mean diameter（GMD）
fractal dimension
