Erigeron annuus (L.) Pers., as a green manure for ameliorating soil exposed to acid rain in Southern China

Liu, Juxiu; Peng, Shanjiang; Faivre-Vuillin, B.; Xu, Zhihong; Zhang, Deqiang; Zhou, Guoyi

doi:10.1007/s11368-008-0041-1

Cited by 21 publications

(10 citation statements)

References 30 publications

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“…To date, it is an urgent and long-term task to improve red soil quality and its nutrient status, which would enhance its productivity and help to restore its ecological functions. Restoration has been suggested to be an important measure for reducing soil and water erosion, increasing soil fertility and improving forest ecosystem function (Liu et al 2008). Numerous studies have reported that red soil quality could be efficiently enhanced after forest restoration by increasing soil microbial diversity, soil enzyme activities, and nutrient contents (Liu et al 2002(Liu et al , 2003Zhao et al 2007;Liu et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Soil soluble organic carbon and nitrogen pools under mono- and mixed species forest ecosystems in subtropical China

et al. 2010

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Purpose The objective of the present study was to assess the differences in soil total C and N, microbial biomass C and N, soil soluble organic C and N among eight monoand mixed species forest ecosystems (18-year-old restoration) in subtropical China. Materials and methods Soil samples were taken at the 0-10 and 10-20-cm depths from each of the eight forest ecosystems: Masson pine (CP1); Pitch pine (CP2); mixed Slash pine and Sweetgum (CBMP1); mixed Slash pine and Camphortree (CBMP2); mixed Masson pine, Sweetgum, and Chinese Gugertree (CBMP3); mixed Sweetgum and Chinese Gugertree (BMP); Chinese Gugertree (BP1); and Sweetgum (BP2). Soil soluble organic C and N pools were measured using hot water and KCl extraction methods. Microbial biomass C (MBC) and N (MBN) were measured by fumigation-extraction method. Soil total C and N were determined using an isotope ratio mass spectrometer. Results and discussion Concentrations of soil soluble organic N (SON) extracted by KCl solution (35.1-116.9 and 11.2-78.2 mg kg -1 ) were greater than those by hot water (20.7-72.8 and 8.4-30.6 mg kg -1 ) in the 0-10 and 10-20-cm soils, while concentrations of soluble organic C (SOC) extracted by KCl solution were lower than those extracted by hot water in the 0-10 cm. Soil soluble C and N pools extracted by both hot water and KCl solution and the MBC and MBN were greatest under the broadleaf forest ecosystems, followed by the mixed conifer-broadleaf forest ecosystems, and then the conifer forest ecosystems. Conclusions Different restored forest ecosystems had significant impacts on soil SOC and SON, and MBC and MBN. The broadleaf forest ecosystems could be a better choice for the restoration of red soil chemical and biological prosperities than the conifer-broadleaf forest ecosystem and coniferous forest ecosystems. A further study is necessary to sample over seasons in order to understand whether the significant impacts on soil properties are related to the sample time. In addition, soil microbial community composition and microbial activity should be measured in such studies to understand mechanisms involved in the dynamics of soil SOC and SON pools.

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Section: Introductionmentioning

confidence: 99%

Soil soluble organic carbon and nitrogen pools under mono- and mixed species forest ecosystems in subtropical China

et al. 2010

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“…Over 80% of N in soil is present in organic form (Schulten and Schnitzer 1998). However, current research on plant N uptake in terrestrial ecosystems has focused mainly on ammonium (NH 4 + ) and nitrate (NO 3 − ) (Blumfield et al 2006, Sigua and Coleman 2006, Yin et al 2007, Liu et al 2008), while soluble organic N (SON) has received little attention due to the uncertainty in its availability for direct uptake by plants and its ecological significance and the technical difficulty in its measurement (Bhogal et al 2000;Lipson and Nösholm 2001;Hannam and Prescott 2003;Jones et al 2004;Zhu and Carreiro 2004;Chen and Xu 2006). In the past few years, results from a number of studies have confirmed that some plants are able to directly utilize and generally prefer amino acids over inorganic N (Schimel and Chapin 1996;Lipson and Monson 1998;Näsholm et al 1998;Lipson et al 1999;Persson and Näsholm 2001;Henry and Jefferies 2003;Weigelt et al 2005).…”

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confidence: 99%

Analysis and behavior of soluble organic nitrogen in forest soils

Chen

2008

J Soils Sediments

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Background, aim, and scope A large proportion of soil nitrogen (N; >80%) is present in organic form. Current research on plant N uptake in terrestrial ecosystems has focused mainly on inorganic N such as ammonium (NH 4 + ) and nitrate (NO 3 − ), while soluble organic N (SON) has received little attention. In recent years, the increasing evidence showing the direct uptake of various amino acids by plants and the predominance of the organic form in N loss by leaching in many forest ecosystems has drawn attention to critically re-examine the nature and the ecological role of soil SON in terrestrial N cycling. However, little is known about the sources and dynamics, chemical nature, and ecological functions of soil SON in forest ecosystems. This paper reviews recent advances in the areas of research on current techniques for characterizing soil SON and the size, nature, and dynamics of soil SON pools in forest ecosystems. Materials and methods The SON represents a significant pool of available and mobile N in forest soils. The SON can be sampled using a number of physical (e.g., suction cup, microdialysis) and chemical (e.g., extraction) methods and analyzed by the wet chemistry method (e.g., persulfate oxidation) and combustion. Chemical and physical fractionation, pyrolysis-mass spectrometry, 13 C and 15 N nuclear magnetic resonance spectroscopy, and 15 N, 13 C, and 14 C isotopic techniques have been used for investigating the nature and dynamics of SON in forest ecosystems. Results and discussion The amount of SON in soil may vary with land use type, forest species, management practices, and analytical procedures used. Statistical figures, based on 116 datasets available in the literature, have shown that concentrations of soil SON can range from 1 mg N kg −1 (dry weight basis) to up to 448 mg N kg −1 , with an average of 35 mg N kg −1 , representing an average of 48% of total soluble N. Soil SON consists of a mixture of structurally diverse N-containing compounds, possibly with the amide N, amino acids, and amino sugars being predominant. The biodegradability of SON largely depends upon its chemical characteristics (e.g., C-to-N ratio). Conclusions Direct utilization of added amino acids by a large number of forest species may present a potentially important new pathway for plant N uptake. However, the evidence of direct utilization of soil native SON by forest plants is still lacking, and the extent of the contribution of SON to forest plants is far from certain. Transformation of soil organic matter into SON, rather than the conversion of SON to NH 4 + /NO 3 − , may be the rate-limiting step, which regulates the overall N cycling in N-limited forest ecosystems.Recommendations and perspectives Future work may well focus on the chemical and biological nature of SON in forest soils, microbial transformation of SON, the nutritional role of the SON pools in the N-limited forest ecosystems, and the potential role of SON in global climate change (e.g., N 2 O emission).

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“…Burton et al 2010;Jiang et al 2010;Sigua and Coleman 2010), Section 3 (e.g. Liu et al 2008;Wang et al 2010) and Section 4 (e.g. Li and Wong 2010;).…”

Section: Soils Researchmentioning

confidence: 99%