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为了探讨农林牧地土壤氮肥力水平,我们在陕北杏子河流域的茶坊一带,选择具有代表性的林地和草地以及条件相似的农地,研究了土壤的氮矿化势,为提高土壤氮肥力提供依据。一、基本情况茶坊位于陕西省安塞县西部丘陵沟壑区,海拔高度1,100—1,600米,属暖温带半干旱大陆性气候,年平均气温9.3℃,年降水量500—600毫米。降水量变化大,分布不均,多集中在7、8、9三个月,占年降水量的60—70%。春季干旱,多西北风;夏季气温高,多暴雨。年平均蒸发量1,800—2,200毫米,比降水量大2.6倍。由于长期单一农业和滥垦、滥牧,破坏了植被和土壤,生态系统遭受破坏,水土流失严重,产量不高。采样地点在蟠龙山(1—5号)和庙沟疙瘩(6—8号)的黄土梁峁坡上,具体位
In order to explore the level of soil nitrogen fertility in agriculture, forestry and pasture, we chose representative woodland and grassland and agricultural land with similar conditions in the tea plantation of Xingzi River basin in northern Shaanxi Province to study the nitrogen mineralization potential of soil. In order to improve soil nitrogen fertilizer Power to provide the basis. I. Basic Information Located in the hilly and gully region of western Ansai County, Shaanxi Province, the tea house is 1,100-1,600 meters above sea level. It belongs to the temperate semi-arid continental climate with annual average temperature of 9.3 ℃ and annual precipitation of 500-600 mm. Large changes in precipitation, uneven distribution, and more concentrated in 7,8,9 three months, accounting for 60-70% of annual precipitation. Spring drought, northwest wind; Summer high temperature, heavy rain. The average annual evaporation of 1,800-2,200 mm, 2.6 times greater than the amount of precipitation. Due to long-term single agriculture and indiscriminate cultivation, pasturing and destruction of vegetation and soil, ecosystems are destroyed, water and soil erosion are serious, and output is not high. Sampling sites in the Broom Hill (1-5) and the temple ditch (6-8) loess slope slope, the specific location