1) nitrogen density
氮密度
1.
Average nitrogen density and total amount of nitrogen in the surface layer (0～20 cm) and the whole soil layers of the major forest soils in China were estimated based on the typical forest soil profiles.
通过对中国典型森林区域土壤剖面的统计计算,分别估算了中国森林土壤表层(0～20cm)和土壤层的平均氮密度和氮库贮量,得出中国森林土壤层的氮密度为34。
2.
Nitrogen density varied substantially with the soil subgroups and regions.
本研究基于中国1∶100万土壤数据库和1490个水稻土剖面数据,在水稻土亚类和土壤大区水平上对中国水稻土氮密度和氮储量的空间变异特征进行研究。
3) Soil nitrogen density
土壤氮密度
1.
The main results were as follows:Soil nitrogen density was influenced by many factors.
本研究选取人口稠密的川中丘陵乡村区域为研究对象,以高分辨率卫星遥感图片与GPS、GIS技术相结合,首先对影响区域土壤氮密度的因素进行分析,结合相关影响因素,采用生态立地法、土地覆盖法、土壤类型法、普通克里格法、多元回归法和回归克里格法估算区域土壤氮密度;最后,采用蒙特卡罗模拟方法对结果进行不确定性的定量评价,获得了较为准确的土壤氮密度空间分布估算结果,找出了适合于村域景观土壤氮密度最佳的空间表达方式。
4) density and amount of fertilizer application
密度和施氮量
1.
Split-plot experiment was conducted to study the effect of density and amount of fertilizer application on Youyan 9.
运用裂区试验研究了密度和施氮量对油研九号产量的影响。
5) density-controlled Si3N4
变密度氮化硅
1.
The density-controlled Si3N4 ceramic was synthesized by half aqueous gel-casting method using starch as template.
本文以淀粉为模板剂,研究了半水基注模凝胶技术制备变密度氮化硅陶瓷材料的方法。
6) nitrogen gas sealing
氮气密封
1.
The mechanism of oil vapour loss is discussed and the application of nitrogen gas sealing technique to store and transportation is introduced.
介绍了氮气密封技术在储运生产中的应用。
补充资料：非密度制约因素(见密度制约因素)
非密度制约因素(见密度制约因素)
l焦非密度制约因素见生态因素、密度制约后
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条