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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Soil microaggregates stability under different land use types in southeastern Nigeria.
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Soil microaggregates stability under different land use types in southeastern Nigeria.

机译：尼日利亚东南部不同土地利用类型下土壤微团聚体的稳定性。

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摘要

Low water stability of soil microaggregates accentuated by increased intensity of cultivation, high soil erodibility and climatic erosivity has become a major cause of increased water erosion process on agricultural lands in Imo State, southeastern Nigeria. Consequently; it has remained one of the most serious soil physical constraints to increased and sustained high level crop production in the area. Thus, this study was conducted in 2006 to quantify the effects of different land use types (LUTs) on the water stability of their various soil microaggregates in the area. Six LUTs [natural forest (NF); oil palm plantation (OPP); plantain plantation (PP); rubber plantation (RP); bush fallow (BF) and continuous cassava cropping (CCC)] were chosen for the study. Under each LUT, traverses were cut at equal intervals to obtain three plots per LUT that served as replications. From each plot, bulk samples were collected from 15 sampling points at 0-20 cm soil depth for determination of aggregate stability and other soil properties. The soil microaggregate stability was measured by clay dispersion ratio (CDR) and aggregated silt and clay, ASC (%) indices. Results showed that the CDR obtained from soil under NF LUT was significantly (P<=0.05) lower (implying higher microaggregate stability) than what were obtained from other LUT soils. Conversely, the CDR of soils under CCC was significantly higher (indicating lower microaggregate stability) than what were obtained under other LUT soils. The relative increase (%) in CDR or decrease in microaggregate stability over the control (NF soil) were 16.67, 54.76, 57.14 and 78.57 for soils under OP, PP, RP, BF and CCC LUTs respectively. Similarly, the ASC (%) under NF soil was significantly (P<=0.05) higher (indicating higher microaggregate stability) than those of other LUT soils. Contrarily, the ASC (%) of CCC, soil was significantly lower (lower microaggregate stability) than other LUT soils. The relative reduction (%) in ASC or microaggregate stability of the soils over the control (NF soil) stood at 25.37, 44.03, 44.03, 44.03 and 62.69 for soils under OPP, PP, RP, BF and CCC LUTs respectively. Correlation of each of the microaggregate stability indices (CDR and ASC) with some soil properties suggested that organic matter (OM), calcium (Ca2+) and magnesium (Mg2+) might be the most important variables related to each of the indices. By running multiple regression analysis, using linear, exponential, semi logarithmic and double logarithmic functional forms, whereas the semi logarithmic form was indicated as the best fit equation relating CDR to clay, OM and Ca; the linear form was the best fit model relating ASC to clay, OM and Ca. Thus, they could be used for prediction purposes.
机译：耕作强度增加，土壤易蚀性和气候侵蚀性加剧加剧了土壤微骨料的低水稳定性，这已成为尼日利亚东南部伊莫州农田水蚀过程增加的主要原因。所以;它仍然是该地区增加和持续高水平作物生产的最严重的土壤物理限制之一。因此，这项研究于2006年进行，以量化不同土地利用类型（LUT）对该地区各种土壤微团粒的水稳定性的影响。六个LUT [天然林（NF）;油棕种植园（OPP）;车前草种植园（PP）;橡胶园（RP）;本研究选择了灌木休闲（BF）和连续木薯种植（CCC）。在每个LUT下，以相等的间隔切割导线，以获取每个LUT的三个重复图。从每个样区中，从0-20厘米土壤深度的15个采样点收集散装样品，以确定集料的稳定性和其他土壤特性。土壤微骨料的稳定性通过粘土分散率（CDR）和聚集的粉砂和粘土，ASC（％）指数来测量。结果表明，在NF LUT下从土壤中获得的CDR比从其他LUT土壤中获得的CDR低得多（ P <= 0.05）（暗示更高的微骨料稳定性）。相反，CCC下土壤的CDR显着高于其他LUT土壤下的CDR（表明较低的微骨料稳定性）。在OP，PP，RP，BF和CCC LUT下，与对照（NF土壤）相比，CDR的相对增加（％）或微骨料稳定性的降低分别为16.67、54.76、57.14和78.57。同样，NF土壤下的ASC（％）显着（ P <= 0.05）比其他LUT土壤高（表明更高的微骨料稳定性）。相反，CCC土壤的ASC（％）显着低于其他LUT土壤（较低的微骨料稳定性）。在OPP，PP，RP，BF和CCC LUTs下，土壤相对于对照（NF土壤）的ASC或微骨料稳定性的相对降低（％）分别为25.37、44.03、44.03、44.03和62.69。每个微骨料稳定性指标（CDR和ASC）与某些土壤性质的相关性表明，有机质（OM），钙（Ca 2 + ）和镁（Mg 2 + >）可能是与每个索引相关的最重要的变量。通过使用线性，指数，半对数和双对数功能形式进行多元回归分析，而半对数形式被认为是将CDR与粘土，OM和Ca相关的最佳拟合方程。线性形式是将ASC与粘土，OM和Ca相关的最佳拟合模型。因此，它们可以用于预测目的。

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