沂蒙山区坡耕花生地垄间植草对土壤理化性质的影响

以沂蒙山区坡耕花生地为研究对象,建立野外原位观测小区,将花生+狗牙根(处理Ⅰ)、花生+草木犀(处理Ⅱ)、花生+黑麦草(处理Ⅲ)、花生+三叶草(处理Ⅳ)、花生+空白对照(处理Ⅴ)5种植草方式进行对比,研究垄间不同植草方式对坡耕花生地土壤理化性质的影响,并运用灰色关联分析法对多个土壤理化性质指标进行综合判定。结果表明:垄间植草方式中土壤粗化指数、砂粒含量、总孔隙度、毛管孔隙度、毛管持水量、有机质及全氮含量出现了不同程度的升高,而容重、黏粒与粉粒、全磷含量呈现下降趋势;与空白对照相比,垄间植草明显改良了土壤理化性质,其中以花生+黑麦草处理效果最优,灰色关联度达到0.931 9,其余依次为花生+三叶草(0.929 6)、花生+草木犀(0.747 6)及花生+狗牙根(0.731 1),空白对照效果最差,灰色关联度仅为0.548 7。

Effects of Grass Planting Between Ridges on Soil Physicochemical Properties at Sloping Peanut(Arachis hypogaea L.) Land in Yimeng Mountainous Area

A case study was conducted in the major peanuts producing area of Yimeng mountainous area,Shandong province,taking sloping Arachis hypogaea land as an example.An in-situ fixed-point experiment was conducted and effects of different herb layers between ridges on soil physicochemical properties at sloping arachis hypogaea land were analyzed through comparison of five kinds of measures: Arachis hypogaea and Bermudagrass cultivar;Arachis hypogae and Melilotus officinalis;Arachis hypogaea and Ryegrass;Arachis hypogaea and Trifolium;Arachis hypogaea and blank control.Gray correlation analysis method(GCAM) was used to comprehensively identify the indicators of soil physicochemical properties under the same measure.Results showed that,the grass planting between ridges makes soil coarsening index,sand content,total porosity,capillary porosity,capillary moisture capacity,soil organic matter and total nitrogen appeared different degree increases,and soil bulk density,clay and silt,total phosphorus showed a trend of decline;compared with the blank control,the grass planting between ridges evidently improved the physicochemical properties of soil,among which the effect of ryegrass was best,with its grey correlation degree of 0.931 9.The others showed a decreasing sequence of Melilotus officinalis(0.929 6),Trifolium intercropping(0.747 6) and Bermudagrass cultivar(0.731 1).Effect of the blank control was the worst,with its grey correlation degree just 0.548 7.