Resource Remobilization Efficiency Varies With Plant Growth Form but Not Between Fens and Bogs
Resource Remobilization Efficiency Varies With Plant Growth Form but Not Between Fens and Bogs
复制标题
DOI：
10.3389/feart.2021.827721
复制
发表时间：
2022-02
期刊：
影响因子：
--
通讯作者：
Yu Cong;Zhongshen Zhang;Bo Liu;Y. Chen;Xiao Li;M. Jiang;Maihe Li
中科院分区：
文献类型：
--
作者：
Yu Cong;Zhongshen Zhang;Bo Liu;Y. Chen;Xiao Li;M. Jiang;Maihe Li
从衰老的叶片中吸收资源是植物体内养分循环的重要策略。然而，我们对沼泽类型(沼泽和沼泽)的资源再动员的反应是否在不同的植物生长形式之间存在差异的理解仍然不清楚。在此基础上，我们对长白山东北部哈尼族泥炭地沼泽和沼泽不同生长方式下的资源再动员进行了评价。对8月(中期)和9月(季末)采集的4种植物叶片和根部的非结构性碳水化合物(NSCs)、氮(N)、磷(P)和钾(K)的含量进行了分析和比较，并计算了沼泽和沼泽中4种植物的资源再动员效率(RRE)。落叶矮生乔木(桦木)和多年生草本植物(芦荟)的叶片RRE相对高于苔藓(Sphagnum Magellanicum)。尽管沼泽和沼泽的叶片营养物质RRE没有差异，但落叶矮化树的叶片NSC RRE沼泽高于沼泽，苔藓NSC RRE沼泽低于沼泽。我们的结果表明，在营养贫乏的生境下，可移动碳水化合物的重新分配似乎比营养物质(N、P和K)更敏感，这可能是导致泥炭地营养限制的原因之一。
Resource resorption from senescing leaves is an important strategy for internal nutrient recycling in plants. However, our understanding of whether the responses of resource remobilization to mire types (fens vs. bogs) differ among various plant growth forms remains unclear. We thus assessed resource remobilization among various growth forms in fens and bogs in the Hani peatland in the Changbai Mountains, northeastern China. We analyzed and compared the concentrations of non-structural carbohydrates (NSCs), nitrogen (N), phosphorus (P), and potassium (K) in leaves and roots collected in August (mid-season) and September (end-season), and calculated the resource remobilization efficiency (RRE) of four species belonging to four growth forms grown in both fens and bogs. The deciduous dwarf trees (Betula fruticosa) and perennial grass (Phragmites australis) had relative higher leaf RRE than the moss (Sphagnum magellanicum). Although leaf nutrient RRE did not differ between fens and bogs, the deciduous dwarf trees had a higher leaf NSC RRE in bogs than in fens, and the moss NSC RRE was lower in bogs than in fens. Our results suggest that reallocation of mobile carbohydrates seems to be more sensitive to the growth condition than nutrients (N, P, and K) under nutrient-poor inhabits, which may be one of the reasons leading to nutrient limitation in peatlands.