Temperature and soil moisture interactively affected soil net N mineralization in temperate grassland in Northern China

Wang, Changhui; Wan, Shiqiang; Xin, Xing; Zhang, Lei; Han, Xingguo

doi:10.1016/j.soilbio.2005.09.009

Cited by 284 publications

(209 citation statements)

References 43 publications

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“…Our observations in this study indicated that soil net N nitrification and net N mineralisation (incubation temperature !08C) increased exponentially with the increase in incubation temperatures, with temperature sensitivity (Q 10 ) of net N mineralisation being 2.20 and 2.49 in the plantation and natural forests. The temperature sensitivity of net N mineralisation observed in our study was comparable to results for coniferous forests of Western Europe (Dalias et al 2002), but greater than the responses from typical Argiudoll, Austrian alpine soil and temperate grassland of Northern China (Sierra 1997;Wang et al 2006;Koch et al 2007).…”

Section: Discussionsupporting

confidence: 82%

“…Many studies have demonstrated that alteration of temperature results in significant effects on soil N mineralisation rates (Rustad et al 2001;Dalias et al 2002;Wang et al 2006). Our observations in this study indicated that soil net N nitrification and net N mineralisation (incubation temperature !08C) increased exponentially with the increase in incubation temperatures, with temperature sensitivity (Q 10 ) of net N mineralisation being 2.20 and 2.49 in the plantation and natural forests.…”

Section: Discussionsupporting

confidence: 54%

“…However, no obvious increases in nitrate were observed at À58C during several incubation times. Previous studies have found that rates of N mineralisation and nitrification were insensitive to lower temperatures (Nadelhoffer et al 1991;Wang et al 2006). In our study, there were also no obvious differences in net nitrification or N mineralisation rates among the lower temperatures (-5, 0 and 58C).…”

Section: Discussionsupporting

confidence: 51%

“…Inorganic N (ammonium and nitrate) in fresh soil were extracted with 2 M KCl at room temperature. Ammonium and nitrate concentrations in extract were measured by the indophenol-blue and phenol disulfonic acid colourimetry (Wang et al 2006).…”

Section: Sampling and Incubation Methodsmentioning

confidence: 99%

“…carbon-pool size and component) (Shaver et al 2000). The responses of soil N transformation to temperature are likely to be complicated by land-use change (Wang et al 2006). It is not clear whether effects of temperature on net N mineralisation vary with land-use patterns.…”

Section: Introductionmentioning

confidence: 99%

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Effects of temperature on soil net nitrogen mineralisation in two contrasting forests on the eastern Tibetan Plateau, China

Liu

Yin

2014

Soil Res.

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Abstract. Intact soil cores from two adjacent forest ecosystems (natural coniferous forest and dragon spruce plantation) were incubated in the laboratory to examine effects of temperature, reforestation and their interactions on rates of nitrogen (N) mineralisation, nitrification and ammonification in the subalpine forest of the eastern Tibetan Plateau. Two contrasting soils were incubated at five temperatures (-5, 0, 5, 15 and 258C) for 4 weeks. Rates of N mineralisation and nitrification were insensitive to temperature at lower temperatures (08C and 58C) but increased over higher temperatures (158C and 258C). Large amounts of ammonium were released for each incubation time in both soils when the incubation temperature was À58C. Therefore, the rates of mineralisation and ammonification at À58C were significantly higher than at the other temperatures. Both the accumulations of inorganic N and rates of N transformation were significantly higher in the natural forest than in the plantation. Moreover, temperature sensitivity of net nitrification and N mineralisation were greater in the natural forest than the spruce plantation. Effects of temperature on accumulations of inorganic N and rates of N transformation were dependent on incubation time and forest ecosystem. Our results suggested that À58C might be a key low temperature for N mineralisation in subalpine forest on the eastern Tibetan Plateau; the effect of projected warming on soil N transformation rate may be less significant in plantation forests than natural forests in this specific region.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionsupporting

confidence: 54%

Section: Discussionsupporting

confidence: 51%

Section: Sampling and Incubation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of temperature on soil net nitrogen mineralisation in two contrasting forests on the eastern Tibetan Plateau, China

Liu

Yin

2014

Soil Res.

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Plant nutrients do not covary with soil nutrients under changing climatic conditions

Luo

Elser

Lü

et al. 2015

Global Biogeochemical Cycles

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Nitrogen (N) and phosphorus (P) play vital roles in plant growth and development. Yet how climate regimes and soil fertility influence plant N and P stoichiometry is not well understood, especially in the belowground plant parts. Here we investigated plant aboveground and belowground N and P concentrations ([N] and [P]) and their stoichiometry in three dominant genera along a 2200 km long climatic gradient in northern China. Results showed that temperature explained more variation of [N] [P]. Plant N:P ratios were unrelated with all climate and soil variables. Plant aboveground and belowground [N] followed an allometric scaling relationship, but the allocation of [P] was isometric. These results imply that internal processes stabilize plant N:P ratios and hence tissue N:P ratios may not be an effective parameter for predicting plant nutrient limitation. Our results also imply that past positive relationships between plant and nutrient stocks may be challenged under changing climatic conditions. While any modeling would need to be able to replicate currently observed relationships, it is conceivable that some relationships, such as those between temperature or rainfall and carbon:nutrient ratios, should be different under changing climatic conditions.

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Stability of grassland soil C and N pools despite 25 years of an extreme climatic and disturbance regime

2016

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Global changes are altering many important drivers of ecosystem functioning, with precipitation amount and disturbance frequency being especially important. Carbon (C) and nitrogen (N) pools are key contemporary attributes of ecosystems that can also influence future C uptake via plant growth. Thus, understanding the impacts of altered precipitation amounts (through controls of primary production inputs) and disturbance regimes (through losses of C and N in biomass) is important to project how ecosystem services will respond to future global changes. A major difficulty inherent within this task is that drivers of ecosystem function and processes often interact, resulting in novel ecosystem responses. To examine how changes in precipitation affect grassland ecosystem responses under a frequent disturbance regime (annual fire), we assessed the biogeochemical and ecological consequences of more than two decades of irrigation in an annually burned mesic grassland in the central United States. In this experiment, precipitation amount was increased by 31% relative to ambient and 1 in 3 years were statistically extreme relative to the long‐term historical record. Despite evidence that irrigation decreased root:shoot ratios and increased rates of N cycling—each expected to reduce soil C and N with annual burning—we detected no changes in these biogeochemical pools. This surprising biogeochemical resistance highlights the need to explore additional mechanisms within long‐term experiments concerning the consequences of global change impacts on ecosystems.

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Temperature and soil moisture interactively affected soil net N mineralization in temperate grassland in Northern China

Cited by 284 publications

References 43 publications

Effects of temperature on soil net nitrogen mineralisation in two contrasting forests on the eastern Tibetan Plateau, China

Effects of temperature on soil net nitrogen mineralisation in two contrasting forests on the eastern Tibetan Plateau, China

Plant nutrients do not covary with soil nutrients under changing climatic conditions

Stability of grassland soil C and N pools despite 25 years of an extreme climatic and disturbance regime

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