CAJ | 학술논문

通过对代表性区域的调查研究,探讨了珠江三角洲耕地土壤质量演化的趋势及其形成机制.结果表明,与第二次土壤普查时期(1980)比较,珠江三角洲耕地土壤有机质全氮稳中有降,土壤速效氮(NO_3~--N)、速效磷含量显著增加,已达丰富水平,土壤速效钾含量有所增加、但仍偏低,土壤有效镁、硼、钼仍严重缺乏,部分土壤有效硅、锰缺乏;伴随大量水田改种蔬菜、水果等经济作物而产生的耕作制度变化、利用强度增加以及相应的化学氮、磷肥料过量投入、蔬菜地施用石灰等管理措施等,是导致珠江三角洲耕地土壤有机质下降和产生新的养分非均衡化的主要影响因素.
통과대대표성구역적조사연구,탐토료주강삼각주경지토양질량연화적추세급기형성궤제.결과표명,여제이차토양보사시기(1980)비교,주강삼각주경지토양유궤질전담은중유강,토양속효담(NO_3~--N)、속효린함량현저증가,이체봉부수평,토양속효갑함량유소증가、단잉편저,토양유효미、붕、목잉엄중결핍,부분토양유효규、맹결핍;반수대량수전개충소채、수과등경제작물이산생적경작제도변화、이용강도증가이급상응적화학담、린비료과량투입、소채지시용석회등관리조시등,시도치주강삼각주경지토양유궤질하강화산생신적양분비균형화적주요영향인소.
The soil quality change and mechanism of cultivated land was studied by soil survey of typical region in the Pearl River Delta. The results showed that, comparing with the second generalsoil survey in 1980s, the content of soil organic matter and total nitrogen had no significant change but performed decrease trend; the available-N(NO_3~--N) and available-P increased obviously, es-pecially the accumulations of available-P adding up to very rich level; the available-K increased slightly, but being still at lower level; the available-Mg, available-B, and available-Mo were still seriously insufficient, some of the soils were poor in available-Si and available-Mn. It was indicated, along with the cropping system change, intensive continuous cultivation, the over fertilization and applying caustic lime in vegetable field for control of plant disease and insects, might be the main factors of the degrease of soil or-ganic matter and the presenting of news nutrient imhalance.