微咸水滴灌条件下氮素在红枣根区的分布特征研究

Distribution Characteristic of Nitrogen under Light-Saline Water Trickle Irrigation in the Root Area of Jujube

在不同的微咸水滴灌条件下,对红枣根区氮素分布特征进行研究,结果表明:在加密监测阶段碱解氮和硝态氮的总体分布都随着土壤深度的增加而减少。这与淡水滴灌的土壤中的氮素分布具有一致性;相同时间和相同深度的土壤中,碱解氮含量随微咸水矿化度的增大而增大;硝态氮的含量先是随矿化度的增加而减少,随后又表现为随矿化度的增加而增大。常规监测时对氮素的水平分布情况分析表明,碱解氮的分布随取样距离的增加而增大,硝态氮整体上却呈现相反的规律,同时相同点位的土壤中碱解氮随微咸水的矿化度的增加而增加,硝态氮却呈现了先小后大的情况。矿化度的差异影响着氮素在土壤水平和垂直方向分布和运移,需进一步对其运移特征和作用机理进行试验和探索。

Under different condition of Light - Saline Water Trickle Irrigation, carrying out the research about the distribution character- istic of nitrogen transportation in the Jujube root areas, the results showed that ： the general nitrogen decreased as the depth increases in close observation stage. This was in agreement to nitrogen distribution of fresh water trickle irrigation. In same period and same depth of soil, the contents of the alkaline nitrogen increased as the Salinity of slight - saline water increase ; and the contents nitric ni- trogen first decreased and then increased as the Salinity increasing. Under conventional observation analyzing the condition about the horizontal distribution of nitrogen showed the distribution of alkaline nitrogen increased as the sample -taken increasing, while nitric nitrogen is wholly on the contrary. At the same time, the same point in soil of alkaline increased as the Salinity of saline water in- crease, however the content of the nitric nitrogen take on the condition that first got smaller and then got bigger. The differences of the Salinity contents influences the distribution and movement of nitrogen in soil horizontal and vertical direction. It shows that farther ex- periment and exploration in its movement and effect mechanism are required.