摘要
利用沼液化肥混合溶液作为分散介质对红壤团聚体进行湿筛,探讨旱作红壤团聚体稳定性对沼液化肥混合溶液的响应机制,为推广沼液合理农用提供理论依据。试验共设7个处理:CF1(100%化学N);CF2(80%化学N+20%沼液N);CF3(60%化学N+40%沼液N);CF4(40%化学N+60%沼液N);CF5(20%化学N+80%沼液N);F(100%沼液N);CK(纯水)。各混合物总N、P、K保持一致,N、P_(2)O_(5)、K_(2)O分别为120、90、135kg·hm^(-2)。分析各处理下土壤>0.25 mm水稳定性团聚体含量(WR_(0.25))、团聚体平均质量直径(MWD)、几何平均直径(GMD)、团聚体稳定率(AR)和分形维数(D)等团聚体稳定性指标。从CF1处理依次至CK处理,WR_(0.25)、MWD、GMD以及AR大致呈现上升的趋势,D呈现下降的趋势;各处理均以<0.25 mm水稳性团聚体含量最高(30.9%~33.9%);各处理WR_(0.25)较供试土壤样品的>0.25 mm机械性团聚体含量(DR_(0.25))均有大幅度的下降。随着混合溶液中沼液用量的增加,WR_(0.25)、MWD、GMD以及AR都呈现上升的趋势,D呈现下降的趋势。化肥水溶液中离子对土壤团聚体具有冲击作用,土壤团聚体的破坏主要表现为破坏大团聚体,形成小团聚体,而有机大分子可以减弱团聚体的分散作用。随着混合溶液中有机物质的增加,土壤团聚体的水稳定性增加。
Wet sieving of red soil aggregates with biogas slurry and fertilizer mixture as dispersive medium is conducted to explore the response mechanism of the stability of dryland farming red soil aggregates to biogas slurry and fertilizer mixture and to provide theoretical basis for popularizing rational agricultural use of biogas slurry.This experiment consists of seven treatments:CF1(100% chemical N);CF2(80% chemical N+20% biogas slurry N);CF3(60% chemical N+40% biogas slurry N);CF4(40% chemical N+60% biogas slurry N);CF5(20% chemical N+80% biogas slurry N);F(100% biogas slurry N);CK(pure water).The total N,P and K of each mixture are equal,and the N-P_(2)O_(5)-K_(2)O is 120-90-135 kg·hm^(-2).The soil >0.25 mm water stable aggregate content(WR_(0.25)),aggregate average mass diameter(MWD),geometric average diameter(GMD),aggregate stability(AR)and fractal dimension(D)were analyzed.From CF1 treatment to CK treatment,WR_(0.25),MWD,GMD and AR show an upward trend,while D shows a downward trend.In each treatment,the content of water stable aggregate < 0.25 mm is the highest(30.9% ~ 33.9%).The content of WR_(0.25) in each treatment is significantly lower than that of >0.25 mm mechanical aggregate(DR_(0.25))in the tested soil samples.With the increase of the biogas slurry in mixed solution,WR_(0.25),MWD,GMD and AR all show an upward trend,while D shows a downward trend.Aqueous solution and ions have an impact on soil aggregates,and the destruction of soil aggregates is mainly manifested as the destruction of large aggregates and the formation of small aggregates,while organic macromolecules can weaken the dispersion of aggregates.The water stability of soil aggregates increases with the increase of organic matter in the mixed solution.
作者
阮仁杰
屠人凤
李阳
胡宏祥
吴俊
RUAN Ren-jie;TU Ren-feng;LI Yang;HU Hong-xiang;WU Jun(Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention,Anhui Agricultural University,Hefei Anhui 230036;School of Resources and Environment,Anhui Agricultural University,Hefei Anhui 230036;College of Land Science and Technology,China Agricultural University,Beijing 100193;Anhui Hemei Environmental Protection Group Co.Ltd.,Hefei Anhui 230000)
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2021年第4期26-32,共7页
Soil and Fertilizer Sciences in China
基金
安徽省教育厅科研项目(KJ2017A159)
农田生态保育与污染防控安徽省重点实验室开放基金(FECPP201703)
国家科技重大专项(2017ZX07603-002-002)。
关键词
旱作红壤
团聚体稳定性
沼液化肥配比
湿筛法
dryland red soil
stability of aggregates
chemical fertilizer ratio of biogas slurry
wet sieving method
