CAJ | 학술논문

以南京市郊集约化蔬菜长期种植基地为对象,采集蔬菜种植年限分别为3~5、15～0、25～30 a的土壤,测定土壤全磷(TP)、速效磷(Olsen-P)、水溶性磷(CaCl_2-P)、生物有效磷(NaOH-P)的含量,并对0-20 cm土层磷素吸附特性进行分析,通过研究土壤磷吸附饱和度(DPS)、最大缓冲容量(MBC)来对土壤磷素流失风险进行评估.结果表明,在0-20 cm土层,除NaOH-P外,其余各形态磷(TP、Olsen-P、CaCl_2-P)都随种植年限延长呈增加趋势.不同种植年限土壤TP、Olsen-P、CaCl_2-P、NaOH-P主要积累在0-20 cm土层,且随着土层深度的增加土壤磷的累积量逐渐降低.DPS随种植年限延长而升高,种植年限25~30 a的菜地0-5 cm土层DPS超过土壤磷素流失环境敏感指标临界值(25%),其MBC也最低,表明随着蔬菜种植年限的延长土壤磷素流失风险加剧,且流失风险主要体现在0-5 cm土层.
이남경시교집약화소채장기충식기지위대상,채집소채충식년한분별위3~5、15～0、25～30 a적토양,측정토양전린(TP)、속효린(Olsen-P)、수용성린(CaCl_2-P)、생물유효린(NaOH-P)적함량,병대0-20 cm토층린소흡부특성진행분석,통과연구토양린흡부포화도(DPS)、최대완충용량(MBC)래대토양린소류실풍험진행평고.결과표명,재0-20 cm토층,제NaOH-P외,기여각형태린(TP、Olsen-P、CaCl_2-P)도수충식년한연장정증가추세.불동충식년한토양TP、Olsen-P、CaCl_2-P、NaOH-P주요적루재0-20 cm토층,차수착토층심도적증가토양린적루적량축점강저.DPS수충식년한연장이승고,충식년한25~30 a적채지0-5 cm토층DPS초과토양린소류실배경민감지표림계치(25%),기MBC야최저,표명수착소채충식년한적연장토양린소류실풍험가극,차류실풍험주요체현재0-5 cm토층.
In order to study accumulation and leaching risk of soil phosphorus, soil samples were collected from vegetable fields, different in intensive vegetable cultivation history (3-5, 15-20 and 25-30 years) in the suburbs of Nanjing for assay of concentrations of total phosphorus (TP), available phosphorus (Olsen-P), dissolved reactive phosphorus (CaCl_2-P) and bio-available phosphorus (NaOH-P), and P adsorption in 0-20 cm soil layer, and for assessment of soil phosphate leaching risk through determination of degree of phosphorus saturation (DPS) and maximum buffer capacity (MBC) of the soils. Results show that the longer the history of intensive vegetable cultivation, the higher the accumulation of phosphorus for all P fractions, except for NaOH-P, which was higher in soils of 3-5 a than in the other two groups. TP, Olsen-P, CaCl_2-P and NaOH-P accumulated mainly in the 0-20 cm soil layer, and decreased in concentration with the depth in profile. DPS increased with the history. In the 0-5 cm soil layers of soils of 25-30 a, the concentration of DPS was even higher than 25%, the environmental sensitive index for soil P loss, while MBC was the lowest, suggesting that the leaching risk of soil phosphorus rises with the cultivation history, particularly in 0-5 cm soil layer.