| 1 | Effect of gap size and forest type on mineral nitrogen forms under different soil properties显示文摘Gaps play a key role in forest ecosystem development and result from either natural processes or targeted forest management activities.The aim of this study was to investigate the interrelationships of soil properties in each of three forest types and two treatments,and to identify factors that influence levels of soil mineral nitrogen forms.The relation between mineral nitrogen and factors of soil parameters and stand type(European beech,Norway spruce,mixed stand)categories were investigated.The spruce forest type stored significant nitrogen in both mineral forms of nitrogen.Moreover,there was a significant linear dependence between N-NO3^-(nitrate anion)concentrations and cation exchange capacity(CEC)parameters such as base cation contents(S-CEC)and potential ureolytic activities(UreasePot),as well as between N-NH4^+(ammonium cation)concentrations and both hydrolytic acidities(Ha-CEC)and ureolytic activities.The dependence of N-NO3^-concentrations on S-CEC contents and UreasePot was negative,especially in adjacent stand.The dependence of N-NH4^+concentrations on Ha-CEC and UreasePot was week in the beech and mixed forest types while it was significantly positive in the spruce forest type. | Ales Kucera Ladislav Holik Elena Munoz Cerro Jan Petricek | 2020 | Journal of Forestry Research2020，31，2： | 2 |
| 2 | Beyond direct neighbourhood effects:higher-order interactions improve modelling and predicting tree survival and growth显示文摘It is known that biotic interactions are the key to species coexistence and maintenance of species diversity.Traditional studies focus overwhelmingly on pairwise interactions between organisms,ignoring complex higher-order interactions(HOIs).In this study,we present a novel method of calculating individual-level HOIs for trees,and use this method to test the importance of size-and distance-dependent individual-level HOIs to tree performance in a 25-ha temperate forest dynamic plot.We found that full HOI-inclusive models improved our ability to model and predict the survival and growth of trees,providing empirical evidence that HOIs strongly influence tree performance in this temperate forest.Specifically,assessed HOIs mitigate the competitive direct effects of neighbours on survival and growth of focal trees.Our study lays a foundation for future investigations of the prevalence and relative importance of HOIs in global forests and their impact on species diversity. | Yuanzhi Li Margaret M.Mayfield Bin Wang Junli Xiao Kamil Krai David Janik Jan Holik Chengjin Chu | 2021 | National Science Review2021，8，5： | 2 |
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