盐渍化平原区玉米产量空间变异与地形关系研究

Spatial Variability of Maize Yield and Relations to Terrain Attributes in Salinized Plain Region

选择华北平原中存在盐渍化的禹城市作为典型研究区,在获取全市范围玉米测产、地形数据信息的基础上,利用空间插值技术研究了地形因子对玉米产量的影响。研究发现,禹城市玉米产量沿东北到西南方向逐渐递增,与地形起伏一致。地形起伏虽然较小,但玉米产量仍随着海拔高度的增加而增加,呈极显著正相关(R=0.263,p<0.01)。平面曲率与玉米产量呈显著负相关(R=-0.245,p<0.05),即田块的平面曲率越大,越易积聚盐分,导致玉米产量越低。地形因子对禹城市玉米产量空间变异起到12.4%的影响作用。

Using Yucheng county with soil salinization as a typical area of the north China plain, spatial variability of maize yields was described and influence of the terrain attributes on maize yields were discussed by space interpolation techniques based on measuring maize yields in field and extracting terrain information. The results showed that maize yields gradually increased along the northeast to southwest of the county with increasing the elevation. Although terrain undulated very slightly, the increasing trend of the elevation was agreement with the distribution of yields from low to high. A very significantly positive correlation （R = 0. 263, p 〈 0.01 ） existed between maize yields and elevation. Meanwhile, a significantly negative correlation （R = - 0. 245, p 〈 0.05） existed between maize yields and plane curvature, indicating that the bigger plane curvature, the easier saline accumulation leading to decreased maize yields. The combined effects of elevation and plane curvature explained 12.4% of the observed variability of maize yields.