Soil organic carbon stocks and CO2 effluxes of native and exotic pine plantations in subtropical China

Wang, Yidong; Wang, Huimin; Xu, Mingjie; Ma, Zeqing; Wang, Zhongliang

doi:10.1016/j.catena.2015.02.003

Cited by 32 publications

(13 citation statements)

References 55 publications

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“…The Masson's pine (MP) and slash pine (SP) plantations were established in 1980s. The initial tree density of MP and SP was about 750 stem ha −1 (Wang et al, ).…”

Section: Methodsmentioning

confidence: 99%

Estimation of Leaf Photosynthetic Capacity From Leaf Chlorophyll Content and Leaf Age in a Subtropical Evergreen Coniferous Plantation

Wang

et al. 2020

JGR Biogeosciences

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Photosynthetic rate is a key source of uncertainty in the modeling of the terrestrial carbon cycle. Recent studies have utilized leaf chlorophyll content (Chl) as a proxy for leaf photosynthetic capacity in croplands and deciduous forests, with little investigation into this relationship for other plant function types and for different leaf ages. In this study, we evaluated the relationship between the maximum rate of carboxylation (Vcmax25) and the maximum electron transport capacity (Jcmax25) at 25 °C with both leaf nitrogen and Chl from different leaf ages (current and previous year) in Masson's pine (Pinus massoniana Lamb.) and slash pine (Pinus elliottii Engelm.) species in a subtropical evergreen coniferous forest. Our results showed small changes in leaf nitrogen over the growing season. In contrast, Vcmax25, Jmax25, and Chl displayed larger seasonal variations. Vcmax25 was more related to leaf Chl than leaf nitrogen in both previous year's and current year's leaves, likely due to the variable partitioning of leaf nitrogen between and within photosynthetic and nonphotosynthetic fractions. Leaf Chl and month after budding (MAB) were the main predictors for Vcmax25 based on the random forest regression analysis. These findings highlighted the problem in using leaf nitrogen as a proxy for Vcmax25 where there is a dynamic nitrogen investment (i.e., with leaf ontogenesis, or between different species) and illustrated the value of using leaf Chl (as retrievable from remotely sensing) and MAB to constrain Vcmax25 in process‐based models to improve the simulation of photosynthetic rates in evergreen coniferous forests.

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“…The Masson's pine (MP) and slash pine (SP) plantations were established in 1980s. The initial tree density of MP and SP was about 750 stem ha −1 (Wang et al, ).…”

Section: Methodsmentioning

confidence: 99%

Estimation of Leaf Photosynthetic Capacity From Leaf Chlorophyll Content and Leaf Age in a Subtropical Evergreen Coniferous Plantation

Wang

et al. 2020

JGR Biogeosciences

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“…Subtropical forests provide an important contribution to global terrestrial ecosystem C storage [26,27]. In southern China, the majority of natural forests were cleared by the late 1970s and first converted into two coniferous plantations, Chinese fir (Cunninghamia lanceolata (Lamb.)…”

Section: Introductionmentioning

confidence: 99%

Conversion of Natural Evergreen Broadleaved Forests Decreases Soil Organic Carbon but Increases the Relative Contribution of Microbial Residue in Subtropical China

Yang

Chen

et al. 2019

Forests

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It has been recognized that land use change affects soil organic carbon (SOC) dynamics and the associated microbial turnover. However, the contribution of microbial residue to SOC storage remains largely unknown in land use change processes. To this end, we adopted a “space for time” approach to examine the dynamics of SOC and amino sugars, which was a biomarker of microbial residue C, in different natural forest conversions. Three typical converted forests were selected: an assisted natural regeneration (ANR) and two coniferous plantations of Cunninghamia lanceolata (Lamb.) Hook (Chinese fir) and Pinus massoniana Lamb. (pine) each. All of these were developed at the same time after the harvest of an old natural forest and they were used to evaluate the effects of forest conversions with contrasting anthropogenic disturbance on SOC and microbial residue C, along with the natural forest. Natural forest conversion led to an approximately 42% decrease in SOC for ANR with low anthropogenic disturbance, 60% for the Chinese fir plantation, and 64% for the pine plantation. In contrast, the natural forest conversion led to a 32% decrease in the total amino sugars (TAS) for ANR, 43% for the Chinese fir plantation, and 54% for the pine plantation at a soil depth of 0–10 cm. The ratios of TAS to SOC were significantly increased following natural forest conversion, with the highest ratio being observed in the Chinese fir plantation, whereas the ratios of glucosamine to muramic acid (GluN/MurA) were significantly decreased in the two plantations, but not in ANR. The contents of SOC, individual amino sugar, or TAS, and GluN/MurA ratios were consistently higher at a soil depth of 0–10 cm than at 10–20 cm for all of the experimental forests. Redundancy analysis showed that microbial residue C was significantly correlated with SOC, and both were positively correlated with fine root biomass, annual litterfall, and soil available phosphorus. Taken together, our findings demonstrated that microbial residue C accumulation varied with SOC and litter input, and played a more important role in SOC storage following forest conversion to plantations with higher anthropogenic disturbance.

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“…Decreased soil respiration under plantation is somewhat counterintuitive, but is good to mitigate global CO 2 emission. However, an increase in soil respiration under plantation does not necessarily mean a decrease of soil carbon storage (Xu et al 2013;Wang et al 2015). After 12 years plantation, both GB and GBH significantly increased soil carbon concentration in 0-20 and 20-40 cm, which led to a net soil C storage.…”

Section: Implications For Global Carbon Cyclingmentioning

confidence: 99%

Responses of soil microbial respiration to plantations depend on soil properties in subtropical China

Zhang

Yue

et al. 2016

Journal of Integrative Agriculture

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Assessing the impact of plantation on microbial respiration (MR) is vitally important to understand the interactions between belowground metabolism and land use change. In this study, cumulative MR was determined by alkali absorption method in 1, 3, 7, 14, 21, 28, 35, 42, 49, 56 days from the soil in a representative plantations in the subtropical region of China. The treatment of plantations contained no plant (CK), orange trees (Citrus reticulata) + Bahia grass (Paspalum notatum) (GB), orange trees (C. reticulata) + Bahia grass (P. notatum) + Soybean (Giycine max(L)Merrill) (GBH). Results showed that plantation had significant effects on microbial respiration and the responses of microbial respiration to plantation from different soil layers and topographies were different: in 0-20cm in uphill: GB > GBH > CK; in 20-40cm in uphill: GBH > CK > GB; in 0-20cm in downhill: GBH > CK > GB; in 20-40cm in downhill: GB > CK > GBH. Furthermore, plantation also altered the relationships between MR and soil properties. In CK, microbial respiration was positively correlated with NH 4 + and soil total N, and negatively correlated with soil moisture, pH, NO 3 and MBC(microbial biomass carbon). In GB, microbial respiration under GB significantly negatively correlated with dissolved organic carbon (DOC). In GBH, microbial respiration under GBH was positively correlated with NH 4 + , MBC, total soil carbon (TC) and total soil nitrogen (TN), and negatively correlated with soil moisture (SM), pH, NO 3 and DOC. The underlying mechanisms could be attributed to soil heterogeneity and the effects of plantation on soil properties. Our results also showed that plantation significantly increased soil C storage, which suggested plantation is a key measure to enhance soil C sequestration and mitigate global CO 2 emission, especially for the soil with low initial soil carbon content or bared soil.

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Soil organic carbon stocks and CO2 effluxes of native and exotic pine plantations in subtropical China

Cited by 32 publications

References 55 publications

Estimation of Leaf Photosynthetic Capacity From Leaf Chlorophyll Content and Leaf Age in a Subtropical Evergreen Coniferous Plantation

Estimation of Leaf Photosynthetic Capacity From Leaf Chlorophyll Content and Leaf Age in a Subtropical Evergreen Coniferous Plantation

Conversion of Natural Evergreen Broadleaved Forests Decreases Soil Organic Carbon but Increases the Relative Contribution of Microbial Residue in Subtropical China

Responses of soil microbial respiration to plantations depend on soil properties in subtropical China

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