Distribution of soil nutrients under and outside tree/shrub canopies on a revegetated loessial slope

Yao, Yufei; Shao, Mingan; Jia, Yongxing

doi:10.1139/cjss-2017-0013

Cited by 7 publications

(11 citation statements)

References 42 publications

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“…The vertical patterns of the SOC, TN, and TP contents exhibited similar patterns, in which the contents decreased as the depth increased, especially below 20 cm. This result was consistent with the results of Yao, Shao, Jia, and Li (), who reported significant decreases in SOC and TN at depths of 40 and 20 cm, respectively. This is partly because of the high fine root biomass and turnover rate in the topsoil and their decreases in the subsoil (Yao et al, ).…”

Section: Discussionsupporting

confidence: 93%

“…This result was consistent with the results of Yao, Shao, Jia, and Li (), who reported significant decreases in SOC and TN at depths of 40 and 20 cm, respectively. This is partly because of the high fine root biomass and turnover rate in the topsoil and their decreases in the subsoil (Yao et al, ). When variations among planting systems along the surveyed soil profile were considered, the soil TN and TP contents differed more from each other in the topsoil than in the subsoil.…”

Section: Discussionsupporting

confidence: 93%

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Afforestation and agroforestry enhance soil nutrient status and carbon sequestration capacity in eastern China

Guo

Wang

et al. 2019

Land Degrad Dev

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Afforestation and agroforestry both sequester atmospheric carbon (C) and store C in the soil. However, the response of soil nutrients and soil organic carbon (SOC) to these practices has not been fully examined, especially in deep soil layers. We therefore investigated the effects of afforestation and agroforestry on the nutrient contents and organic carbon (OC) stocks within a 100-cm depth in eastern China. The soil nutrient contents and stoichiometry as well as the SOC contents and stocks exhibited different vertical patterns and varied among the five planting systems.The total nitrogen (TN), total phosphorus (TP), and SOC contents decreased dramatically at a 20-cm depth, and the total potassium (TK) content exhibited a different pattern. Compared with adjacent croplands and nurseries, the forest plantation and agroforestry systems had higher SOC stocks, ranging from 42.9 to 111.6 t·hm −2 in the whole soil profile. The SOC distribution among the depth gradient varied among planting systems, and the topsoil SOC stocks played crucial roles in total SOC storage within a depth of 100 cm in the cropland and nursery systems. The soil pH and bulk density (BD) were negatively correlated with the SOC content, and a significant positive linear relationship occurred between the TN and SOC contents and between the TP and SOC contents. We recommend that combinations of nitrogen (N) and phosphorus (P) fertilizers would benefit SOC storage and improve stabilization in agroforestry and plantation systems.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 93%

Afforestation and agroforestry enhance soil nutrient status and carbon sequestration capacity in eastern China

Guo

Wang

et al. 2019

Land Degrad Dev

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“…The formation of “fertile island” by tree/shrub might alter the nutrients, microbial community, and structure of the soil in vertical and horizontal directions (Waring et al, ; Yao et al, ). Our study showed that SOC, TN, TP, BD, SWC, and pH presented a strong spatial heterogeneity.…”

Section: Discussionmentioning

confidence: 99%

“…In recent years, many studies have focused on the fine‐scale variations of soil nutrients and understory plants around single shrubs, which is important knowledge for optimal evaluations of restoration effects (Rong et al, ; Yao, Shao, Jia, & Li, ). Waring et al () indicated that individual plant have extensive and great effects on soil chemistry, especially in desert, and plantation age of shrubs increases the spatial heterogeneity of soil.…”

Section: Introductionmentioning

confidence: 99%

Storage of C, N, and P affected by afforestation with Salix cupularis in an alpine semiarid desert ecosystem

et al. 2017

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Few systemic assessments have evaluated the success of these afforestation programs in alpine semiarid desert ecosystems in the Qinghai-Tibet Plateau. In this study, we investigated the influences of three Salix cupularis plantation age classes (6, 18, and 34 years) on the carbon (C), nitrogen (N), and phosphorus (P) storages and stoichiometry of the soil-plant ecosystem. The consequences of S. cupularis plantation induced soil spatial heterogeneity. The soil-plant ecosystem C storage increased after the plantation. The N storage showed an increasing trend from 6 to 18 years and then slightly decreased. The P storage presented a continuously declining trend. The result indicated that the imbalance in soil N, P, C occurred with plantation age because of the imbalance of their inputs. The N and P uptakes from subsoil and redistribution to topsoil by S. cupularis may contribute to meet N and P demands for the understory plants. Leaf N:P ratios varied from 8.3 to 17.5. These results imply that N and P status are the main factors limiting plant growth in the alpine-cold desert ecosystem. Thus, we recommend adding N and P fertilizers during plant growth. KEYWORDSafforestation, alpine semiarid desert, soil-plant system, stoichiometry, C,N and P storage, salix plantations 1 | INTRODUCTION Arid and semiarid regions are widely distributed in China, accounting for more than 16% of the land area (Wang, Zhang, Hasi, & Dong, 2010). For a long time, these regions have been managed using traditional agricultural and pastoral practices (Liu, Wu, Ding, Tian, & Shi, 2017;Wiesmeier et al., 2016). The land desertification in this region has primarily resulted from an imbalance of between human activities and global climate changes (Wang, Xue, Zhou, & Guo, 2015). Afforestation is an effective method of restoring desert lands, and it has a potentially useful impact on soil quality, vegetation structure, soil nutrient storages, and stoichiometry Therefore, the impact of changes in these nutritive element cycles on soil-plant ecosystems has received widespread attention.Salix cupularis is a shrub that belongs to the Salicaceae family, and it can grow in extremely harsh alpine semiarid environments. In addition, this shrub plays an important role in resisting wind erosion, fixing sand, preserving water, and increasing plant diversity. Since the 1980s, the Qinghai-Tibet Plateau, China, has become one of the key , bulk density (BD), sand content 95.83%, silt 2.04%, and clay 2.13%. | Experimental design and samplingSoil and plant sample collection was conducted in August 2016.Several typical areas along the eastern Qinghai-Tibet Plateau with negligible human disturbance were selected as sample collection sites.Each age class was represented by three plantation ages (6, 18, and 34 yr-old), and each plantation was repeated three times. Three clusters of S. cupularis were randomly selected for each plantation age, and basic information on the S. cupularis samples of each age is shown in Table S1. First, to test the understory plants, ...

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“…Accordingly, the area of planted forest increased from 168 to 278 M ha from 1990 to 2015 at the global scale (Keenan et al, 2015). However, long-term soil nutrient availability, which is essential for sustainable timer and/or carbon emission reduction, is not fully understood (Berthrong, Pineiro, Jobbagy, & Jackson, 2012), and the altered pools and cycles resulting from afforestation can in turn affect biomass production and ecosystem function (Yao, Shao, Jia, & Li, 2017). During the last two decades, soil carbon (C) and soil nitrogen (N) have been extensively studied at different scales and major influencing factors such as climate, prior land use, plantation age, tree species, and soil texture have been studied in depth (Barcena et al, 2014;Berthrong et al, 2012;Liu, Yang, Wang, Huang, & Li, 2018).…”

Section: Introductionmentioning

confidence: 99%

Changes in soil phosphorus and its influencing factors following afforestation in Northern China

Peng

et al. 2019

Land Degrad Dev

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Changes in soil carbon (C) and nitrogen (N) stocks following afforestation have been widely studied at different scales. However, soil phosphorus (P) dynamics following afforestation are poorly understood, especially at the regional scale. This paper studied the effects of prior land use (cropland, grassland, and barren land), tree species (conifer, broadleaf, shrub, and mixed), plantation age (young, middle, and old), and climate on soil total phosphorus and available phosphorus stocks change in the top 20 cm following afforestation based on a synthesis of 50 recent publications in northern China. We also considered possible confounding effects between these factors. The results showed that, overall, soil total phosphorus and available phosphorus stocks significantly decreased by 7.3% and significantly increased by 8.8%, respectively, following afforestation. Prior land use was found to be the most important driver in determining changes in soil P stocks. Compared with a significant decrease in P of afforestation of former cropland and grassland, afforestation of barren land caused no clear decrease in P. Tree species was found to have a limited effect on changes in soil P after afforestation, and broadleaf afforestation has a lower P demand than coniferous forests in the studied region. Plantation age did not affect the dynamics of P stocks. Our results showed confounding effects of precipitation, prior land use, and tree species, which impacted the estimates of the drivers of changes in P stocks. These results highlighted the importance of tree species selection and replication across sites that receive different amounts of precipitation.

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Distribution of soil nutrients under and outside tree/shrub canopies on a revegetated loessial slope

Cited by 7 publications

References 42 publications

Afforestation and agroforestry enhance soil nutrient status and carbon sequestration capacity in eastern China

Afforestation and agroforestry enhance soil nutrient status and carbon sequestration capacity in eastern China

Storage of C, N, and P affected by afforestation with Salix cupularis in an alpine semiarid desert ecosystem

Changes in soil phosphorus and its influencing factors following afforestation in Northern China

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