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通过在温室条件下施加不同剂量的重过磷酸钙(0,50和100mg·kg-1P),对典型水铝英石土壤(Orthic Allophanic Soil)的土壤植物有效磷、磷素营养和伴生有金雀花(Cytisus scoparius)或黑麦草(Lolium multiflorum)的辐射松苗木生长变化情况进行了研究。结果表明,施加磷肥增强了辐射松根际和磷素匮乏土体的有效磷。与辐射松苗伴生的金雀花、黑麦草根际土壤有效磷也增加。辐射松新枝和老枝松针、茎和根系中磷含量随施加重过磷酸钙剂量的增加而增加;但是金雀花、黑麦草对辐射松苗磷素营养的影响依赖于土壤磷状态。未施肥处理下,与金雀花伴生的辐射松新枝和老村松针、茎和根系中磷含量要高于与黑麦草伴生的辐射松苗,而施肥处理下,结果相反。这可能与金雀花生长大量消耗土壤中有效磷有关。因为,在两个施肥剂量(50mg·kg-1P和100mg·kg-1P)上,与金雀花伴生的辐射松根际土壤中Bray-2磷含量始终低于与黑麦草伴生的辐射松根际土壤。此外,在施肥浓度100mg·kg-1下,与金雀花伴生的辐射松苗干特质量低于黑麦草伴生的辐射松。说明在中、高施肥水平,辐射松苗与黑麦草伴生生长好于与金雀花伴生,因为在施肥水平较高条件下,金雀花生长旺盛,且与辐射松苗竞争磷素和其它营养元素。图1表5参47。
By applying different dosages of SSP (0, 50 and 100 mg · kg-1 P) under greenhouse conditions, the contents of available phosphorus, phosphorus and associated gold in soil of Orthic Allophanic Soil Cytisus scoparius or Lolium multiflorum were studied. The results showed that the application of phosphate fertilizer enhanced the availability of available phosphorus in rhizosphere and phosphorus-deficient soils. With B. radiata pine needles, ryegrass rhizosphere soil available phosphorus also increased. The content of phosphorus in the new shoots and the old needles of the Pinus radiata increased with the increase of the dosage of the dosages of the superphosphate. However, the effects of the brooms and the ryegrasses on the phosphorus nutrition of the radiata pine needles depend on the soil phosphorus status. Under the condition of no fertilization, the content of phosphorus in new shoots of Pinus radiata and the old needles, stems and roots associated with Broom was higher than that of P. radiata associated with ryegrass, but the results were opposite under fertilization. This may be related to the growth of brooms that consume a significant amount of available phosphorus in the soil. Because at both fertilization doses (50 mg · kg-1 P and 100 mg · kg-1P), the Bray-2 P content in the rhizosphere soil associated with B. glabra is consistently lower than that of the rhizosphere soil associated with ryegrass . In addition, under the concentration of 100 mg · kg-1, the quality of the dried pine radiated seedlings was lower than that of ryegrass. The results showed that at medium and high levels of fertilization, the accompanying growth of radiata pine and ryegrass was better than that of broomcorn, because the broom was vigorous in high fertilization level and competed with radiata pine seedlings for phosphorus and other nutrients. Figure 1 Table 5 Reference 47.