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耕作力學(xué)研究中的土壤結(jié)構(gòu)表現(xiàn)與評(píng)價(jià)
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    南京地區(qū)農(nóng)地耕作層土壤顯示2種土壤結(jié)構(gòu)形態(tài)：機(jī)械耕作以及生物學(xué)特征的土壤結(jié)構(gòu)表現(xiàn)。前者表現(xiàn)為可分離的較大尺度土垡，且土垡影響到作物根系的生長(zhǎng)；后者表現(xiàn)為生物孔洞的存在。將涵蓋所有尺度的土壤粒子構(gòu)成的耕層土壤空間拓?fù)潢P(guān)系定義為土壤“廣義結(jié)構(gòu)”，從而使耕作研究超出于土壤結(jié)構(gòu)的農(nóng)業(yè)與化學(xué)框架。耕作影響到土壤的廣義結(jié)構(gòu)，進(jìn)而影響到不同尺度下生物系統(tǒng)的繁殖、生長(zhǎng)與活動(dòng)。

    Abstract:

    A field investigation on the tilled layer soil in Nanjing region revealed two distinctive types of soil structures: machinery-till related and biological related structures. The former was featured with relatively large-scale disintegrated soil clods，having a negative effect on corn root development, the later was characterized with the presence of bio-channels. The spatial topological relations among soil particles, encompassing different scales from primary soil particles to relatively large-scale soil clods as a result from tillage operations, were defined as soil macro-structures. Soil macro-structure brought forward a scope that was not to be coped with agricultural or chemical approaches. Soil tillage affects soil macro-structure, which further affects soil biological performances in different scales.

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丁啟朔,丁為民,孟為國(guó),韓英.耕作力學(xué)研究中的土壤結(jié)構(gòu)表現(xiàn)與評(píng)價(jià)[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2007,38(8):62-66.[J]. Transactions of the Chinese Society for Agricultural Machinery,2007,38(8):62-66.

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