Abstract Agroforestry and grass buffers have been developed as part of the management system for row crop areas in temperate regions to improve soil and water quality and diversify farm income. A study was conducted to evaluate the influence of agroforestry and grass buffers relative to row crop management on soil hydraulic properties (saturated hydraulic conductivity, soil water retention, and pore size distribution) for a claypan soil. The experimental watersheds for this project were located at the Greenley Memorial Research Center. The paired watersheds for the study area were under no-till management with a corn (Zea mays L.)–soybean (Glycine max L.) rotation since 1991. The agroforestry buffer watershed and grass buffer watershed had vegetative buffer strips planted between row crop areas, which were 4.5 m wide and 36.5 m apart with vegetation composed of grasses, legumes, and trees. Throughout the grass buffer and agroforestry buffer strips, redtop (Agrostis gigantea Roth), brome grass (Bromus spp.), and birdsfoot trefoil (Lotus corniculatus L.) were planted. For the agroforestry buffers, pin oak (Quercus palustris Muenchh), swamp white oak (Quercus bicolar Willd.), and bur oak (Quercus macrocarpa Michx.) trees were planted. Soil cores were taken from four 10-cm depth increments with 6 replicates, and hydraulic and physical properties were determined. Significant differences (P < 0.05) were found among the treatments for bulk density, with the row crop treatment having higher values compared with the buffer treatments. Trends also showed higher saturated hydraulic conductivity for the agroforestry buffer treatment compared with the row crop treatment for the 0 to 10 cm and 30 to 40 cm soil depths. These buffer treatments slightly improved soil hydraulic properties after 17 years for this claypan soil.

中文翻译：

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农林缓冲剂对与行作物管理相关的土壤水力特性的影响

摘要 农林业和草地缓冲区已被开发作为温带地区行作物区管理系统的一部分，以改善土壤和水质，并使农业收入多样化。进行了一项研究，以评估与中耕作物管理相关的农林业和草缓冲液对粘土质土壤的土壤水力特性（饱和导水率、土壤保水性和孔径分布）的影响。该项目的实验流域位于格林利纪念研究中心。自 1991 年以来，研究区的配对流域采用免耕管理，玉米 (Zea mays L.)-大豆 (Glycine max L.) 轮作。农林缓冲流域和草缓冲流域在中耕作物之间种植了植物缓冲带面积为 4.5 m，面积为 36。相距 5 m，植被由草、豆类和树木组成。在整个草缓冲带和农林业缓冲带中，种植了红顶（Agrostis gigantea Roth）、雀麦草（Bromus spp.）和鸟足三叶草（Lotus corniculatus L.）。对于农林业缓冲区，种植了针栎（Quercus palustris Muenchh）、沼泽白橡树（Quercus bicolar Willd.）和橡树（Quercus macrocarpa Michx.）树。土壤核心取自四个 10 厘米深度增量，重复 6 次，并确定水力和物理特性。在堆积密度处理之间发现显着差异（P < 0.05），与缓冲处理相比，中耕作物处理具有更高的值。趋势还表明，对于 0 至 10 厘米和 30 至 40 厘米的土壤深度，农林业缓冲处理的饱和导水率高于中耕作物处理。这些缓冲处理在 17 年后略微改善了这种粘土盘土壤的土壤水力特性。