安塞新修黄绵土农地有机质消长与平衡  

Growth and Decline and Balance of Organic Matter in Newly Built Loessal Soil Farmland in Ansai County

作　　者：李香兰[1] 郑剑英[1] 吴瑞俊 

机构地区：[1]中国科学院水利部水土保持研究所

出　　处：《水土保持研究》1996年第2期23-28,共6页Research of Soil and Water Conservation

摘　　要：通过对新修黄绵土农地有机质的田间定位与尼龙袋模拟试验研究得出：（１）新修黄绵土农地，增加施肥量，尤其是有机肥用量，是提高陕北丘陵沟壑区土壤有机质的主要途径；（２）作物根茬腐殖化系数除与生物气候条件有关外，与本身化学组成关系密切。四种作物根茬腐殖化系数为：糜子根茬＞黄豆根茬＞谷子根茬＞养麦根茬；（３）原土壤中有机质矿质化系数，以休闲地采用化学动力学一级反应方程求得的数据较稳定，并接近大田实际情况；（４）利用有机质平衡定量施肥模式，可算出在陕北黄绵土区要达到土壤有机质培肥目标的有机肥用量．By ways of field-position and nylon sack simulation, the organic matter in newly built farmland of Loessal soil was studied. The conclusion is come to as follows: 1. Increasing the amount of fertilizer applied, especially, the organic manure to a newly built farmland of Loessal soil is a primary way to raise the content of soil organic matter in loess hilly and gully region of north Shaanxi. 2. In addtion to climatic factors,the humification coefficient of crop root stubble is closely related to its chemical composition. The humification coefficient order from bigger to smaller of 4 crops root stubble is broom corn millet, soybean, millet and buck wheet, 3. The mineralization coefficient of original soil organic matter,the datums evaluated chemi-dynamics reation equation of rank I is steadier in fallow land than in others, and it is close to field actual condition, 4. By using the quantitative manure applied model of organic matter balance, it could be calculated that the amount of organic manure applied with which to achieve the aim of cultivating soil fertility in respect of organic manure in north Shaanxi area of loessal soil.

关 键 词：有机质消化 腐殖化系数 矿化质系数 黄绵土 施肥 

分 类 号：S157.41[农业科学—土壤学] S153.621[农业科学—农业基础科学]