Dioecious species have secondary trait dimorphism in resource acquisition, allocation, and a skewed sex ratio. Yet, it is unclear how their sex-specific nutrient acquisition strategy affects the contributions of inorganic and organic phosphorus (P) soil pools to plant-available P. Here, the contribution of inorganic and organic P sources to available P in soil and sex-specific P acquisition during the whole growing season (from June to October) was assessed in a 20-year-old Populus euphratica plantation via analysing the transformation of soil P pools. Poplar females obtain available inorganic P by increasing specific root length (by 71% compared with males) and releasing organic acids to mobilise P from precipitated P (HCl-P), thus obtaining higher P than males during the mid-growing season (June). The increased mobilisation of moderately precipitated P in the rhizosphere was more significant in females during the whole growing season. During the late-growing season, males showed increased alkaline phosphatase activities (by 25% compared with females) and maintained a higher abundance of arbuscular mycorrhiza fungi to obtain P via higher consumption of organic and residual P (decreased by 68% and 24% from June to October). These changes in P acquisition strategies reflect the temporal niche differentiation: females acquire inorganic P mainly during the beginning and middle of the season, whereas males take up organic P and HCl-P, preferably in the second half of the season. The strategic adjustment of sex-specific P acquisition modulated the transformation of organic and inorganic P sources in soil towards plant-available P, increasing resource niche partitioning between two poplar sexes to maintain P supply.

雌雄异株的物种在资源获取、分配和性别比例倾斜方面具有次要性状二态性。然而，尚不清楚它们的性别特异性养分获取策略如何影响无机和有机磷 (P) 土壤库对植物有效磷的贡献。这里，无机和有机磷来源对土壤和性别中有效磷的贡献通过分析土壤磷库的转化，评估了20年生胡杨人工林整个生长季（6月至10月）的特定磷吸收量。雌性杨树通过增加比根长度（与雄性相比增加71%）并释放有机酸来动员沉淀磷（HCl-P）中的磷来获得有效的无机磷，从而在生长中期（6月）获得比雄性更高的磷。在整个生长季节，雌性根际中度沉淀磷的动员增加更为显着。在生长后期，雄性表现出较高的碱性磷酸酶活性（与雌性相比增加了25%），并保持了较高的丛枝菌根真菌丰度，通过消耗更多的有机磷和残留磷来获取磷（与雌性相比分别减少了68%和24%）。六月至十月）。磷获取策略的这些变化反映了时间生态位的差异：雌性主要在季节初和中期获取无机磷，而雄性则最好在季节后半段获取有机磷和HCl-P。性别特异性磷获取的战略调整调节了土壤中有机和无机磷源向植物有效磷的转化，增加了两种杨树性别之间的资源生态位分配以维持磷供应。