Carbon Stocks across a Fifty Year Chronosequence of Rubber Plantations in Tropical China

Liu, Chenggang; Pang, Jiaping; Jepsen, Martin Rudbeck; Luo, Wentao; Tang, Jianwei

doi:10.3390/f8060209

Cited by 21 publications

(12 citation statements)

References 36 publications

(48 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, our study showed that litter contributed less than 2% of the carbon and nitrogen stocks to the ecosystem in the three types of larch forest ecosystems, resulting from the lower biomass in litter. This result is consistent with previous studies [34,58], which found that the litter contributed little (about 6%) to ecosystem carbon stocks.…”

Section: Ecosystemsupporting

confidence: 93%

Carbon and Nitrogen Stocks in Three Types of Larix gmelinii Forests in Daxing’an Mountains, Northeast China

Xiao

Man

Duan

2020

Forests

View full text Add to dashboard Cite

Studying carbon and nitrogen stocks in different types of larch forest ecosystems is of great significance for assessing the carbon sink capacity and nitrogen level in larch forests. To evaluate the effects of the differences of forest type on the carbon and nitrogen stock capacity of the larch forest ecosystem, we selected three typical types of larch forest ecosystems in the northern part of Daxing’an Mountains, which were the Rhododendron simsii-Larix gmelinii forest (RL), Ledum palustre-Larix gmelinii forest (LL) and Sphagnum-Bryum-Ledum palustre-Larix gmelinii forest (SLL), to determine the carbon and nitrogen stocks in the vegetation (trees and understories), litter and soil. Results showed that there were significant differences in carbon and nitrogen stocks among the three types of larch forest ecosystems, showing a sequence of SLL (288.01 Mg·ha−1 and 25.19 Mg·ha−1) > LL (176.52 Mg·ha−1 and 14.85 Mg·ha−1) > RL (153.93 Mg·ha−1 and 10.00 Mg·ha−1) (P < 0.05). The largest proportions of carbon and nitrogen stocks were found in soils, accounting for 83.20%, 72.89% and 64.61% of carbon stocks and 98.61%, 97.58% and 96.00% of nitrogen stocks in the SLL, LL and RL, respectively. Also, it was found that significant differences among the three types of larch forest ecosystems in terms of soil carbon and nitrogen stocks (SLL > LL > RL) (P < 0.05) were the primary reasons for the differences in the ecosystem carbon and nitrogen stocks. More than 79% of soil carbon and 51% of soil nitrogen at a depth of 0–100 cm were stored in the upper 50 cm of the soil pool. In the vegetation layer, due to the similar tree biomass carbon and nitrogen stocks, there were no significant differences in carbon and nitrogen stocks among the three types of larch forest ecosystems. The litter carbon stock in the SLL was significantly higher than that in the LL and RL (P < 0.05), but no significant differences in nitrogen stock were found among them (P > 0.05). These findings suggest that different forest types with the same tree layer and different understory vegetation can greatly affect the carbon and nitrogen stock capacity of the forest ecosystem. This indicates that understory vegetation may have significant effects on the carbon and nitrogen stocks in soil and litter, which highlights the need to consider the effects of understory in future research into the carbon and nitrogen stock capacity of forest ecosystems.

show abstract

Section: Ecosystemsupporting

confidence: 93%

Carbon and Nitrogen Stocks in Three Types of Larix gmelinii Forests in Daxing’an Mountains, Northeast China

Xiao

Man

Duan

2020

Forests

View full text Add to dashboard Cite

show abstract

“…The soil pH values in the four sites are typical for the calcareous soils in semiarid plantations in Iran [35] . In the present study, soil pH declines with stand age (Table 3), according to past research [26,34] . Reduction in soil pH in the older stands of this study was probably related to vegetative coverage, which caused extensive secretion of organic acids associated with accelerated organic matter decomposition.…”

Section: Resultssupporting

confidence: 76%

“…The soil underlying the oldest stand (PI) showed the highest clay percentage in both depths, according to past research [34] ; whereas the highest percentage of silt was recorded in the middle-aged stand (PII) in both depths (Table 2).…”

Section: Resultsmentioning

confidence: 66%

Soil properties across a chronosequence of Ailanthus altissima in semiarid plantations

Aghajani

2019

View full text Add to dashboard Cite

Afforestation is a main tool for preventing desertification and soil erosion in arid and semiarid regions of Iran. Large-scale afforestation, however, has poorly understood consequences for the future ecosystems in the term of ecosystems protection. The objective of the present study is to identify changes in soil properties following different intervals of planting of Ailanthus altissima (tree of heaven) in semiarid afforestation of Iran (Chitgar Forest Park, Tehran). For this purpose, sand, silt and clay ratios, bulk density, soil moisture, pH, electrical conductivity, phosphorus, potassium, magnesium, calcium, sodium, total soil N, and total carbon was measured. Our study highlighted the potential of the invasive trees by A. altissima, to alter soil properties along chronosequence. Almost all soil quality attributes showed a declining trend with stand age. A continuous decline in soil quality indicated that the present land management may not be sustainable. Therefore, an improved management practice is imperative to sustain soil quality and maintain long-term productivity of plantation forests. Thinning activity will be required to reduce the number of trees competing for the same nutrients especially in a older stand to protect forest soils.

show abstract

“…This notion is, however, increasingly being challenged, as numerous studies have questioned the role of shifting cultivation as a driver of deforestation in MSA and demonstrated the complex system of crops, fallow vegetation and forests to yield various ecosystem services and resources for the benefit of local livelihoods and forest environments in the uplands [22]. For example, shifting cultivation has been shown to maintain positive hydrological properties [5] compared to intensified land uses, reduce soil erosion in ways similar to intact forest in the fallow phase [44][45][46][47], and store carbon in quantities that compare to long-rotation perennial plantations [48][49][50].…”

Section: Traditional Upland Land Use Systemsmentioning

confidence: 99%

“…Transitions from short-rotation shifting cultivation to rubber plantations may increase tree cover and carbon storage [4,49], while transition from long-rotation shifting cultivation or areas under forest to rubber plantations causes a net decrease in carbon storage [4,48]. Studies from Xishuangbanna and Laos indicate that the aboveground carbon stock in intensively managed rubber plantations is higher than in low-intensively managed smallholder plantations, which, among other things, is due to a higher stocking density [48,50,93].…”

Section: Rubbermentioning

confidence: 99%

What Awaits Myanmar’s Uplands Farmers? Lessons Learned from Mainland Southeast Asia

Jepsen

Palm

Bruun

2019

Land

Self Cite

View full text Add to dashboard Cite

Mainland Southeast Asia (MSA) has seen sweeping upland land use changes in the past decades, with transition from primarily subsistence shifting cultivation to annual commodity cropping. This transition holds implications for local upland communities and ecosystems. Due to its particular political regime, Myanmar is at the tail of this development. However, with Myanmar’s official strategy of agricultural commercialization and intensification, recent liberalization of the national economy, and influx of multinational agricultural companies, the effects on upland land transitions could come fast. We analyze the current state of upland land use in Myanmar in a socio-economic and political context, identify the dynamics in three indicator commodity crops (maize, cassava, and rubber), and discuss the state driven economic, tenurial and policy reforms that have occurred in upland areas of mainland Southeast Asian countries in past decades. We draw on these insights to contextualize our study and hypothesize about possible transition pathways for Myanmar. The transition to annual commodity cropping is generally driven by a range of socio-economic and technical factors. We find that land use dynamics for the three indicator crops are associated with market demand and thus the opening of national Southeast-Asian economies, research and development of locally suitable high yielding varieties (HYVs), and subsidies for the promotion of seeds and inputs. In contrast, promotion of HYVs in marginal areas and without adequate agricultural extension services may results in agricultural contraction and yield dis-intensification. The environmental impacts of the transition depend on the transition pathway, e.g., through large-scale plantation projects or smallholder initiatives. The agricultural development in upland MSA follows a clear diffusion pattern with transition occurring first in Thailand, spreading to Vietnam, Cambodia and Laos. While these countries point to prospects for Myanmar, we hypothesize that changes will come slow due to Myanmar’s sparse rural infrastructure, with uncertainty about tenure, in particular in areas still troubled by armed conflicts, and unwillingness of international investors to approach Myanmar given the recent setbacks to the democratization process.

show abstract

Carbon Stocks across a Fifty Year Chronosequence of Rubber Plantations in Tropical China

Cited by 21 publications

References 36 publications

Carbon and Nitrogen Stocks in Three Types of Larix gmelinii Forests in Daxing’an Mountains, Northeast China

Carbon and Nitrogen Stocks in Three Types of Larix gmelinii Forests in Daxing’an Mountains, Northeast China

Soil properties across a chronosequence of Ailanthus altissima in semiarid plantations

What Awaits Myanmar’s Uplands Farmers? Lessons Learned from Mainland Southeast Asia

Contact Info

Product

Resources

About