scholarly journals Divergent Responses of Foliar N:P Stoichiometry During Different Seasons to Nitrogen Deposition in an Old-Growth Temperate Forest, Northeast China

Forests ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 257 ◽  
Author(s):  
Dongxing Yang ◽  
Hongrui Mao ◽  
Guangze Jin
Keyword(s):  
Northeast China ◽  
Temperate Forest ◽  
Temperate Forests ◽  
Woody Species ◽  
Life Forms ◽  
N Deposition ◽  
Old Growth ◽  
N:P Stoichiometry ◽  
Different Seasons ◽  
Conifer Tree

Atmospheric nitrogen (N) deposition has rapidly increased during the last few decades; however, the seasonal responses of leaf N:P stoichiometry to N deposition remain unclear. In 2008, a simulated N deposition experiment (0, 30, 60, and 120 kg·N·ha−1·yr−1) was conducted in an old-growth temperate forest in Northeast China. In 2014, the leaves of 17 woody species and soil were sampled in spring, summer, and autumn in each treatment, and N:P stoichiometry was assessed. Community N and P in summer were significantly lower than that in spring and autumn. Unlike broadleaved species, conifers showed no significant variation among the three seasons. N addition significantly enhanced community N and soil available P but decreased soil total P in summer and autumn, and decreased community P, as well as the P concentration of three life forms (conifer, tree, and shrub), in autumn. Our results emphasize the importance of multiple sampling across seasons in temperate forests. Arguing against the traditional consensus, the productivity of the old-growth temperate forests is limited by both N and P.

scholarly journals The influence of mountain temperate forests on the hydrology in northeast China

2003 ◽  
Vol 79 (2) ◽  
pp. 297-300 ◽  
Author(s):  
Xiaohua Wei ◽  
Xiaofeng Zhou ◽  
Chuankuan Wang
Keyword(s):  
Forest Management ◽  
Northeast China ◽  
Temperate Forest ◽  
Temperate Forests ◽  
Spatial Scales ◽  
Management Strategies ◽  
Forest Hydrology ◽  
Surface Flows ◽  
Mongolian Oak

Presented is a review of results from long-term hydrological studies at the Mao-Er-Shan ecological station in northeast China. In comparison to harvested watersheds in northeast China, unlogged temperate forests reduced peak discharge and surface flows at all observed watershed scales (2m2 to > 10 000 ha). However, no consistent patterns on low flows and annual mean flows were observed. The reason for the inconsistency is unclear and may be due to the utilization of different methodologies applied at the various spatial scales. We also found that stemflow is an important mechanism for Mongolian oak (Quercus mongolica Fisch) to adapt to nutrient-poor and dry soils. These results are important for developing forest management strategies and reforestation programs in northeast China. Key words: Temperate forest, hydrology, stemflow, interception, streamflow, evapotranspiration

scholarly journals Disentangling the relative importance of spatio-temporal parameters and host specificity in shaping arbuscular mycorrhizal fungus communities in a temperate forest

Mycorrhiza ◽  
2021 ◽  
Author(s):  
Leonie Grünfeld ◽  
Magkdi Mola ◽  
Monika Wulf ◽  
Stefan Hempel ◽  
Stavros D. Veresoglou
Keyword(s):  
Host Plant ◽  
Community Composition ◽  
Temperate Forest ◽  
Temperate Forests ◽  
Mycorrhizal Fungus ◽  
Woody Species ◽  
Arbuscular Mycorrhizal ◽  
Forest Site ◽  
Plant Host ◽  
Time Space

AbstractMany woody and herbaceous plants in temperate forests cannot establish and survive in the absence of mycorrhizal associations. Most temperate forests are dominated by ectomycorrhizal woody plant species, which implies that the carrying capacity of the habitat for arbuscular mycorrhizal fungi (AMF) is relatively low and AMF could in some cases experience a limitation of propagules. Here we address how the AMF community composition varied in a small temperate forest site in Germany in relation to time, space, two plant host species, and also with regard to the degree to which plots were covered with AMF-associating woody species. The AMF communities in our study were non-random. We observed that space had a greater impact on fungal community composition than either time, mycorrhizal state of the close-by woody species, or the identity of the host plant. The identity of the host plant was the only parameter that modified AMF richness in the roots. The set of parameters which we addressed has rarely been studied together, and the resulting ranking could ease prioritizing some of them to be included in future surveys. AMF are crucial for the establishment of understory plants in temperate forests, making it desirable to further explore how they vary in time and space.

Effects of six years of simulated N deposition on gross soil N transformation rates in an old-growth temperate forest

2017 ◽  
Vol 29 (3) ◽  
pp. 647-656 ◽  
Author(s):  
Peng Tian ◽  
Jinbo Zhang ◽  
Christoph Müller ◽  
Zucong Cai ◽  
Guangze Jin
Keyword(s):  
Temperate Forest ◽  
N Deposition ◽  
Soil N ◽  
Old Growth ◽  
N Transformation ◽  
Transformation Rates ◽  
Soil N Transformation

Modelling leaf phenology of some trees with accumulated temperature in a temperate forest in northeast China

2021 ◽  
Vol 489 ◽  
pp. 119085
Author(s):  
Zhenzhao Xu ◽  
Qijing Liu ◽  
Wenxian Du ◽  
Guang Zhou ◽  
Lihou Qin ◽  
...  
Keyword(s):  
Northeast China ◽  
Temperate Forest ◽  
Leaf Phenology ◽  
Accumulated Temperature

scholarly journals Effects of nitrogen and phosphorus additions on nitrous oxide emission in a nitrogen-rich and two nitrogen-limited tropical forests

2016 ◽  
Vol 13 (11) ◽  
pp. 3503-3517 ◽  
Author(s):  
Mianhai Zheng ◽  
Tao Zhang ◽  
Lei Liu ◽  
Weixing Zhu ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Tropical Forests ◽  
N2o Emission ◽  
N Deposition ◽  
Soil N ◽  
N Addition ◽  
Old Growth ◽  
Old Growth Forest ◽  
P Addition ◽  
Stimulation Of

Abstract. Nitrogen (N) deposition is generally considered to increase soil nitrous oxide (N2O) emission in N-rich forests. In many tropical forests, however, elevated N deposition has caused soil N enrichment and further phosphorus (P) deficiency, and the interaction of N and P to control soil N2O emission remains poorly understood, particularly in forests with different soil N status. In this study, we examined the effects of N and P additions on soil N2O emission in an N-rich old-growth forest and two N-limited younger forests (a mixed and a pine forest) in southern China to test the following hypotheses: (1) soil N2O emission is the highest in old-growth forest due to the N-rich soil; (2) N addition increases N2O emission more in the old-growth forest than in the two younger forests; (3) P addition decreases N2O emission more in the old-growth forest than in the two younger forests; and (4) P addition alleviates the stimulation of N2O emission by N addition. The following four treatments were established in each forest: Control, N addition (150 kg N ha−1 yr−1), P addition (150 kg P ha−1 yr−1), and NP addition (150 kg N ha−1 yr−1 plus 150 kg P ha−1 yr−1). From February 2007 to October 2009, monthly quantification of soil N2O emission was performed using static chamber and gas chromatography techniques. Mean N2O emission was shown to be significantly higher in the old-growth forest (13.9 ± 0.7 µg N2O-N m−2 h−1) than in the mixed (9.9 ± 0.4 µg N2O-N m−2 h−1) or pine (10.8 ± 0.5 µg N2O-N m−2 h−1) forests, with no significant difference between the latter two. N addition significantly increased N2O emission in the old-growth forest but not in the two younger forests. However, both P and NP addition had no significant effect on N2O emission in all three forests, suggesting that P addition alleviated the stimulation of N2O emission by N addition in the old-growth forest. Although P fertilization may alleviate the stimulated effects of atmospheric N deposition on N2O emission in N-rich forests, this effect may only occur under high N deposition and/or long-term P addition, and we suggest future investigations to definitively assess this management strategy and the importance of P in regulating N cycles from regional to global scales.

Respiration of downed logs in an old-growth temperate forest in north-eastern China

2010 ◽  
Vol 25 (6) ◽  
pp. 500-506 ◽  
Author(s):  
Jiabing Wu ◽  
Xinjian Zhang ◽  
Haolei Wang ◽  
Jinwei Sun ◽  
Dexin Guan
Keyword(s):  
Temperate Forest ◽  
Eastern China ◽  
Old Growth ◽  
North Eastern
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