irrigable land

Its results show that DN mainly originated from irrigable land first, mound and hill second.

结果表明，溶解态氮主要来自水浇平地，其次是低山和丘陵。

while in water and irrigable land, the mean, variance was a little bit low, the grey level was symmetry;

水体和灌溉耕地的均值、方差值很低，灰度值均匀，内部变化小；

From 1987 to 2002, the area of the river, irrigable land, forest and beach landscape types presented a decreasing trend while the area of landscape types of pools, paddy field, dry land and construction land presented an increasing trend.

1987￣2002年景观格局动态变化显著：河流景观、水浇地景观、林地景观和滩地景观类型的面积呈减小趋势，坑塘景观、稻田景观、旱地景观和建设用地景观类型面积则呈增加趋势。

The area of irrigable land in Guanzhong is15 times as that of southern Qinling.

比较关中地区与陕南地区的水浇地面积，关中地区是陕南地区的15倍；

Similar variation curves of effective moisture were found in soils of low grass, irrigable land and arid land under same climate.

同一气候背景下，浅草地、灌溉田和旱田的土壤水分有效含量具有一致的变化曲线。