摘要
为全面了解浙江省水耕人为土的肥力现状及其变化趋势,对浙江全省水耕人为土耕作层的有机质、pH值、全氮、有效磷和有效钾状况进行统计分析。结果表明:全省水耕人为土的有机质和全N质量分数分别在20～40和1～2g·kg-1之间,以中量水平的为主,与第2次土壤普查时期相比,土壤有机质和全N含量平均分别下降了6.37%和6.32%;水耕人为土的pH值在3.02～9.80之间,相差达6.78个pH单位,以酸性为主,与第2次土壤普查时期相比,目前水耕人为土呈现明显的酸化,其中pH值在5.5以下的土壤比例明显地增加,而pH值在5.5～7.5之间的土壤比例明显地下降;土壤有效P的平均含量为第2次土壤普查期间的4～5倍,但仍有一定比例的水耕人为土有效P处于低级别状态;土壤有效K总体上趋于低水平和中水平,但比第2次土壤普查时略有增加。分析认为,施肥结构的变化和水田长期旱作是引起土壤肥力变化的主要原因。
In order to understand the status and changing trend of soil fertility of stagnic anthrosols in Zhejiang Province, soil organic matter, pH, total N, available P and available K of stagnic anthrosols covering all 11 districts of Zhejiang Province were investaged. The results showed that soil organic matter and total N of the stagnic anthrosols in Zhejiang Province were mainly classified as medium level, mostly ranging from 20 to 40 g. kg-1 for organic matter, and 1 to 2 g. kg-1 for total N. pH values varied greatly from 3.02 to 9.80, and difference of pH values between the highest and the lowest reached 6.78. Most of the stagnic anthrosols were acidic soils. As compared with those obtained at 1980s, mean soil organic matter and total N declined by 6.37% and 6.32%, respectively. Stagnic anthrosols in Zhejiang Province had been significantly acidified in the past 30 years, and the proportion of soils with pH 〈 5.5 increased and that of soils with pH 5.5-7.5 decreased than those obtained at 1980s. Mean soil available P was about 4-5 times of that obtained at 1980s. However, there was a high proportion of the soils with low level of available P. Soil available K was mainly classified as low to medium levels. The mean available K was higher than that obtained at 1980s. Changes in fertilization structure and transformation of landuse from rice cultivation to upland were thought as main causes of the changes in soil fertility of the stagnic anthrosols.
出处
《浙江大学学报（农业与生命科学版）》
CAS
CSCD
北大核心
2012年第4期429-437,共9页
Journal of Zhejiang University:Agriculture and Life Sciences
基金
国家自然科学基金资助项目(40771090
40471064)
关键词
浙江省
水耕人为土
肥力指标
土地利用
土壤酸化
养分不均衡
Zhejiang Province
stagnie anthrosols
fertility indices
land use
soil acidification
nutrient imbalance
