In Eucalyptus forestland, soil organic carbon, total nitrogen, available potassium contents and soil PH decreased significantly; soil available phosphorus and exchangeable magnesium contents, net nitrogen mineralization rate and ammonification rate also decreased but showed no significant difference. In shrubland, soil exchangeable calcium content increased significantly, but the contents of other nutrients had no significant change.
13. 评价指标包括土壤肥力指标和重金属指标,其中土壤肥力指标包括有机质、速效磷、速效钾、碱解氮;重金属指标包括铜、铅、镉、铬。
Assessment indicator system include fertility indicator and heavy metal indicator, thereinto the fertility indicator include organic matter, pH, available N, Olesen-P and available K, heavy metal indicator include Cd, Cr, Pb and Hg.
14. 适用于各种农作物对氮磷元素的需求,是一种水溶性速效复合肥,溶解后固形物较少,有效磷( AP2O5)与总氮含量的比例较适宜(约2.56:1),是高浓度磷复肥最主要的品种。
Brief Introduction】 Applicable to a variety of crops on the demand for nitrogen and phosphorus elements, is a quick water-soluble compound, dissolved solids less available phosphorus (AP2O5) and total nitrogen content ratio is more appropriate (about 2.56:1), high concentrations of phosphate and compound fertilizer is the most important species.
15. 处理3也提高了土壤中的速效磷养分含量。
Also it could increase soluble phosphorus content in soil.
16. 而对速效磷的推算,效果相对差些。
The result of predicting content of total phosphorus is better than that of available phosphorus.
17. 土壤速效磷在很大程度上决定土壤球囊霉素的含量和分布。
Soil available phosphorus, to a large degree, determines the content and distribution of soil glomalin.
18. 本文研究了速效水范围内水磷耦合对冬小麦幼苗的N、P、K吸收量的影响。
Coupling effect of water and phosphorus on N, P, K uptake by winter wheat seedlings was studied.
19. 施磷对土壤速效磷含量及径流磷组成的影响。
Effect of phosphorus application on soil available P and different P form in runoff.
20. 结果表明:从1982年到2004年,研究区土壤速效磷和速效钾的含量都有所增加,前者增加更为显著。
The results showed that the average content of soil AP and AK went up from 1982 to 2004, and the former increased more significantly.