Afforestation has an important role in biodiversity conservation and ecosystem function improvement.A meta-analysis was carried out in China,which has the largest plantation area globally,to quantify the effects of pl...Afforestation has an important role in biodiversity conservation and ecosystem function improvement.A meta-analysis was carried out in China,which has the largest plantation area globally,to quantify the effects of plantings on soil microbial diversity.The results showed that the overall effect of afforestation on soil microbial diversity was positive across the country.Random forest algorithm suggested that soil carbon was the most important factor regulating microbial diversity and the positive response was only found with new plantings on low-carbon bare lands but not on high-carbon farmlands and grasslands.In addition,afforestation with broadleaved species increased microbial diversity,whereas planting with conifers had no effect on microbial diversity.This study clarified the effects of plantings on soil microbial diversity,which has an important implication for establishing appropriate policies and practices to improve the multiple functionalities(e.g.,biodiversity conservation and climate change mitigation)during plantation establishment.展开更多
大气氮沉降影响树木水力结构,进而影响树木的生长和生存。然而,目前关于叶片水力性状对氮沉降的响应尚不明确,而且该响应可能与物种或植物功能型有关。本研究以中国东北地区水曲柳(Fraxinus mandshurica,阔叶被子植物)和兴安落叶松(Lari...大气氮沉降影响树木水力结构,进而影响树木的生长和生存。然而,目前关于叶片水力性状对氮沉降的响应尚不明确,而且该响应可能与物种或植物功能型有关。本研究以中国东北地区水曲柳(Fraxinus mandshurica,阔叶被子植物)和兴安落叶松(Larix gmelinii,针叶裸子植物)人工林为研究对象,利用长达16年的施氮(10 g N m^(−2)yr^(−1))试验研究了氮添加对两种树种叶片水力性状的影响。用自然干燥法测定了叶片压力-容积曲线,用复水动力学法量化了叶片最大水力导度(K_(leaf_max))和抗栓塞阻力(P50leaf)。研究结果表明,与水曲柳相比,兴安落叶松具有较高的K_(leaf_max)和较强的干旱容忍性(即较低的质壁分离点的相对含水量(RWC_(tlp))和弹性模量(ε),较负的P50leaf)。此外,氮添加增加了水曲柳的叶膨压损失点水势(πtlp)、叶饱和含水量时的渗透势(π0)和叶水容(Cleaf_mass),但对兴安落叶松的这些性状影响不显著,表明水曲柳对氮添加更敏感。氮添加增加了水曲柳和兴安落叶松的K_(leaf_max)和P50leaf。水曲柳的πtlp和π0均与叶密度(LD)正相关,而Cleaf_mass与LD负相关。兴安落叶松的K_(leaf_max)与LD正相关,P50leaf与LD负相关。两个树种的K_(leaf_max)与P50leaf均呈负相关关系。我们的研究表明,长期氮添加降低了这两个重要造林树种的叶片干旱容忍性,这一发现加深了我们对氮沉降背景下树木水力表现的理解。展开更多
基金supported by the National Key Research and Development Program of China(2021YFD2200401)the National Natural Science Foundation of China(31901293)。
文摘Afforestation has an important role in biodiversity conservation and ecosystem function improvement.A meta-analysis was carried out in China,which has the largest plantation area globally,to quantify the effects of plantings on soil microbial diversity.The results showed that the overall effect of afforestation on soil microbial diversity was positive across the country.Random forest algorithm suggested that soil carbon was the most important factor regulating microbial diversity and the positive response was only found with new plantings on low-carbon bare lands but not on high-carbon farmlands and grasslands.In addition,afforestation with broadleaved species increased microbial diversity,whereas planting with conifers had no effect on microbial diversity.This study clarified the effects of plantings on soil microbial diversity,which has an important implication for establishing appropriate policies and practices to improve the multiple functionalities(e.g.,biodiversity conservation and climate change mitigation)during plantation establishment.
基金supported by the Natural Science Foundation of China(32171634)Open Grant for Key Laboratory of Sustainable Forest Ecosystem Management(Northeast Forestry University)+1 种基金Ministry of Education(KFJJ2021ZD02)Starting Research Fund from Hangzhou Normal University(2018QDL005).
基金This work was supported by the National Natural Science Foundation of China(31901278)the National Science and Technology Support Program of China(2011BAD37B01)the Program for Changjiang Scholars and Innovative Research Team in Universities(IRT_15R09).
文摘大气氮沉降影响树木水力结构,进而影响树木的生长和生存。然而,目前关于叶片水力性状对氮沉降的响应尚不明确,而且该响应可能与物种或植物功能型有关。本研究以中国东北地区水曲柳(Fraxinus mandshurica,阔叶被子植物)和兴安落叶松(Larix gmelinii,针叶裸子植物)人工林为研究对象,利用长达16年的施氮(10 g N m^(−2)yr^(−1))试验研究了氮添加对两种树种叶片水力性状的影响。用自然干燥法测定了叶片压力-容积曲线,用复水动力学法量化了叶片最大水力导度(K_(leaf_max))和抗栓塞阻力(P50leaf)。研究结果表明,与水曲柳相比,兴安落叶松具有较高的K_(leaf_max)和较强的干旱容忍性(即较低的质壁分离点的相对含水量(RWC_(tlp))和弹性模量(ε),较负的P50leaf)。此外,氮添加增加了水曲柳的叶膨压损失点水势(πtlp)、叶饱和含水量时的渗透势(π0)和叶水容(Cleaf_mass),但对兴安落叶松的这些性状影响不显著,表明水曲柳对氮添加更敏感。氮添加增加了水曲柳和兴安落叶松的K_(leaf_max)和P50leaf。水曲柳的πtlp和π0均与叶密度(LD)正相关,而Cleaf_mass与LD负相关。兴安落叶松的K_(leaf_max)与LD正相关,P50leaf与LD负相关。两个树种的K_(leaf_max)与P50leaf均呈负相关关系。我们的研究表明,长期氮添加降低了这两个重要造林树种的叶片干旱容忍性,这一发现加深了我们对氮沉降背景下树木水力表现的理解。
