论文部分内容阅读
在江苏省如皋市六个时期土壤几种肥力性质资料的基础上,本文讨论了该市过去30年来土壤肥力性质和土壤综合肥力的时空演变。结果表明,30年来该市的土壤有机质和有效磷含量不断增加,且增加趋势明显;土壤全氮亦增加,但近年来已趋于稳定;土壤速效钾含量一直在较低水平上徘徊。作为土壤肥力综合质量指标的内梅罗质量指数,在空间上,无论在何时期,均是以分布于东部的水耕人为土(白蒲系)和南部的潮湿雏形土(长青沙系)为最高;分布于中西部的干润雏形土(郭园系)和潮湿雏形土(磨头系、桃园系)最低;分布于东北部、西北部及南部的潮湿雏形土(搬经系、东陈系、张黄港系、营防系)土壤肥力质量综合指数处于中间。30年间全市土壤肥力质量指数总体上呈增长态势,但各地区变化趋势略有不同。1974年至1982年全市土壤肥力质量综合指数未有明显变化;1982年～1997年中部增长较快,而南部、东部增长较慢。1997年～2004年东、南部增长速度较快而中部增长较慢。30年来尽管土壤肥力质量整体得到改善,但由于影响土壤肥力质量综合指数变化的核心因素是土壤有机质,所以,综合质量指数的变化并不能反映由于养分的不平衡(钾的缺乏)导致的近年来粮食产量的徘徊。未来在保持目前管理条件使土壤整体质量得到提高外,还应当注意养分的平衡管理,使该市的粮食产量得到进一步提高。
Based on the data of several soil fertility characteristics during the six periods of Rugao in Jiangsu Province, this paper discusses the temporal and spatial evolution of soil fertility and soil fertility in the past 30 years. The results showed that the content of soil organic matter and available phosphorus increased continuously in the past 30 years and the trend of increase was obvious. Soil total nitrogen also increased but stabilized in recent years. Soil available potassium had been hovering at a relatively low level. The Nemerow mass index, as a comprehensive index of soil fertility, was spatially and horizontally distributed in the eastern part of the hydroponic artificial soil (Bai Pu system) and in the southern wet embryonic soil (Changqing sap) (Highest in the Guoyuan line) and humid embryonic soil (the head line in the Mogao and Taoyuan lines) distributed in the central and western parts of the country. The moist embryonic soil distributed in the northeast, northwest and south Chen Department, Zhang Huanggang Department, Department of Camp Defense) Soil Fertility Quality Index is in the middle. In the past 30 years, the soil fertility quality index of the whole city showed an increasing trend, but the trend of change in each region was slightly different. From 1974 to 1982, the comprehensive index of soil fertility quality of the whole city did not change obviously. From 1982 to 1997, the growth of central China was rapid while the growth of southern and eastern China was slower. From 1997 to 2004, the growth rate in the east and the south was relatively fast while that in the middle part was slower. Although the overall quality of soil fertility has been improved over the past 30 years, the change in the composite quality index does not reflect recent years due to nutrient imbalance (lack of potassium) due to the fact that the core factor affecting the change of soil fertility and quality index is soil organic matter. The hovering of grain output. In the future, maintaining the current management conditions to improve the overall quality of soil, we should also pay attention to the balanced management of nutrients so that the city’s grain output will be further increased.