Shouzhong Li

Intraspecific variation in plant functional traits and ecological strategies is typically overlooked in most studies despite its pivotal role at the local scales and along short environmental gradients. While CSR theory has been used to classify ecological strategies (competitive C; stress‐tolerant, S; ruderal, R) in different plant species, its ability to explain intraspecific variation in ecological strategies remains uncertain. Here, we sought to investigate intraspecific variation in ecological strategies for Pinus massoniana, a pioneer conifer tree for ecological restoration in Changting County, southeast China. By measuring key leaf traits and canopy height of 252 individuals at different ontogenetic stages from three plots spanning distinctive stages along early ecological restoration and calculating their C, S, and R scores, we constructed an intraspecific CSR system. All individual strategies shifted across three restoration stages, with adults from higher S component to higher C component while juveniles from higher S component to higher R component. Our results suggest that while strategies of all P. massoniana individuals start with tolerance to environmental stress, as restoration proceeds, adult transition towards completion for light, whereas juveniles shift to an acquisitive resource use. The study reveals an intraspecific pattern of strategy variation during forest restoration, contributing to our understanding of how plants adapt to diverse environments.

收集国内公开发表的有关植物叶片养分再吸收的相关文献，从中提取叶片氮（N）和磷（P）再吸收效率（RE）、N和P含量及环境因子等数据，对植物叶片养分再吸收特征及其影响因子进行系统分析. 结果表明：N和P再吸收效率分别与衰老叶中对应养分含量存在显著负相关关系，表明养分再吸收效率越高再吸收程度也越高. N、P再吸收效率的差值与成熟叶N/P呈显著负相关，表明植物在生长过程中会加强对限制性元素的选择再吸收. 叶片N再吸收效率随纬度增加而增加，与年均气温（MAT）、年均降雨量（MAP）呈负相关关系，而P再吸收效率与三者的相关性并不显著. 不同生活型植被P再吸收效率无显著差异，固氮植物N再吸收效率显著低于除藤本以外的非固氮植物，乔木、灌木、草本、藤本间N再吸收效率无显著差异. 本文对叶片养分再吸收效率与环境、生物影响因子的探讨证实了“相对再吸收假说”（植物生长过程当受到某种元素限制时会对该元素具有较高的再吸收效率）. （图4 表5 参43）

Neonatal mortality reduction in China over past two decades was reported from nationwide sampling surveys, however, how high risk pregnancy affected neonatal outcome is unknown. The objective of this study was to explore relations of pregnancy complications and neonatal outcomes from a regional birth population. In a prospective, cross-sectional survey of complete birth population-based data file from 151 level I-III hospitals in Huai’an region in 2010, pregnancy complications were analyzed for perinatal morbidity and mortality in association with maternal and perinatal characteristics, hospital levels, mode of delivery, newborn birth weight and gestational age, using international definition for birth registry and morbidities. Pregnancy complications were found in 10% of all births, in which more than 70% were delivered at level II and III hospitals associated with higher proportions of fetal and neonatal death, preterm birth, death at delivery and congenital anomalies. High Cesarean section delivery was associated with higher pregnancy complications, and more neonatal critical illnesses. The pregnancy complications related perinatal morbidity and mortality in level III were 2–4 times as high as in level I and II hospitals. By uni- and multi-variate regression analysis, impact of pregnancy complications was along with congenital anomalies and preterm birth, and maternal child-bearing age and school education years contributing to the prevalence. This survey revealed variable links of pregnancy complications to perinatal outcome in association with very high Cesarean section deliveries, which warrants investigation for causal relations between high risk pregnancy and neonatal outcome in this emerging region.