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为了解结缕草克隆整合作用的生长代价与收益,及其与土壤氮磷比的关系,以克隆植物结缕草(Zoysia japonica)为研究对象,研究了对主匍匐茎实施4种切断处理(连接、轻度切断、中度切断和重度切断)和3种氮磷比(N∶P2O5=7∶1、N∶P2O5=14∶1、N∶P2O5=21∶1)处理对结缕草植株生长和生物量积累的影响,并进行生长代价与收益的分析。结果表明:无论在何种氮磷比条件下,与主匍匐茎连接相比,不同程度的切断处理均显著降低结缕草克隆植株的一级A分株数、复合节数和主匍匐茎的长度、生物量及其生物量分配,显著增加一级B分株数、二级A、B分枝数、母株生物量和A、B分枝生物量分配。结缕草克隆植株对根系生物量的分配随氮磷比的升高而增大,对A分枝的生物量分配(25.7%~47.6%)始终高于对B分枝的生物量分配(3.9%~16.5%)。结缕草在低氮磷比(N∶P2O5=7∶1)生境中,生长最为适宜,积累的总生物量显著高于中、高氮磷比生境。在任何氮磷比养分条件下,分别对主匍匐茎实施中度切断、轻度切断和不切断(连接)处理时,其克隆植株总生物量分别为3.65 g、2.90 g和2.94 g,均高于重度切断处理。因此,结缕草的克隆整合作用在不同切断处理间存在不同程度的生长代价与收益,长期而完整的克隆整合使结缕草克隆植株的一级A分株、复合节和匍匐茎的生长显著受益,而一级B分株、二级A、B分枝和母株的生长则出现明显的损耗。
In order to understand the growth cost and benefits of Zoysia mathematica colonization and its relationship with soil N / P ratio, four clonal treatments were carried out on the main stoloniferous plant (Zoysia japonica) , Mild cut, moderate cut and heavy cut) and three nitrogen and phosphorus ratios (N: P2O5 = 7: 1, N: P2O5 = 14: 1, N: P2O5 = 21: 1) And the impact of biomass accumulation, and analysis of growth costs and benefits. The results showed that compared with the main stolons connection, the cut-off treatment significantly reduced the number of primary A branches, the number of composite nodes and the length of main stolons in the clones of Zoysia japonica, And the biomass allocation, significantly increased the number of first-level B plants, the number of second-class A and B branches, the biomass of parent plants and the biomass distributions of A and B branches. The distribution of biomass in root biomass of Zoysia japonica increased with the increase of N and P. The biomass allocation to branch A (25.7% -47.6%) was always higher than that of branch B (3.9 % ~ 16.5%). Zoysia japonica was most suitable for growth in low N / P ratio (N: P2O5 = 7: 1) habitat, and the total biomass accumulated was significantly higher than that of medium and high N / P ratio habitats. The results showed that the total biomass of clonal plants was 3.65 g, 2.90 g and 2.94 g, respectively, under moderate nitrogen and phosphorus ratio under medium, moderate and no cuttings (connection) Severe cut off treatment. Therefore, the clonal integration of Zoysia japonica had different growth costs and benefits in different cut-off treatments. The long-term and complete clonal integration significantly benefited the growth of primary A ramets, composite knots and stolons in Zoysia japonica clonal plants , Whereas the growth of primary B ramets, secondary A, B ramets and parental plants showed obvious loss.