Effects of Tree Root Density on Soil Total Porosity and Non-Capillary Porosity Using a Ground-Penetrating Tree Radar Unit in Shanghai, China

Yu, Bo; Xie, Changkun; Cai, Shize; Yan, Chen; Lv, Yongpeng; Mo, Zulan; Liu, Tianlei; Yang, Zhiwen

doi:10.3390/su10124640

Cited by 35 publications

(20 citation statements)

References 25 publications

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“…where f(x) is the linear score of soil physiochemical properties, x is the value of soil properties, and L and U are the maximum and minimum values of each soil physiochemical property, respectively. In this study, the function "more is better" was applied to most of the soil properties (TOP, CP, NCP, SMC, pH, SOM, TN, NN, AN, TP, AP, TK, and AK) due to their positive effects on plant growth (Chen et al, 2013;Yu et al, 2018). The scoring function "less is better" was used for BD due to its inhibitory effect on root growth and soil porosity (Andrews et al, 2003).…”

Section: Comprehensive Assessment Index Of Soil Physiochemical Propertiesmentioning

confidence: 99%

Effects of rubber plantations on soil physicochemical properties on Hainan Island, China

Sun

Lan

et al. 2021

J of Env Quality

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Recent and rapid expansion of rubber [Hevea brasiliensis (Willd. ex A. Juss.) Müll.Arg.] plantations requires understanding their effects on soil physicochemical properties and soil quality. An ideal testbed for analyzing such land-use change and its impacts is Hainan Island, the largest tropical island in China, which in recent decades has seen a dramatic expansion in the rubber industry. Based on 14 soil physicochemical properties at two soil depths (0-20 and 20-40 cm), a comprehensive assessment index was established using principal component analysis to assess soil qualities under rubber plantations (RPs; monoculture and intercropping) and five additional land-use types (areca palm [Areca L.], eucalyptus [Eucalyptus loxophleba Benth.] and banana [Musa L.] plantations, secondary forest, and tropical rainforest [TR]). The following results were obtained: (a) total porosity, ammoniacal N, total P, available P, and soil organic matter were vital soil physicochemical properties contributing to the comprehensive assessment index; (b) the comprehensive assessment indices of RPs were significantly lower than those of TR and areca palm plantation; (c) intercropping improves most soil physicochemical properties in RPs comparing monoculture and intercropped RPs; and (d) redundancy analysis demonstrated that landuse type interacted with climatic, geographical, and edaphic factors and collectively explained about half of the variation in the soil physicochemical properties across the study area. Deteriorating soil quality by converting TR to RPs and other land-use types provides another reason to protect TRs, especially on area-limited islands like Hainan.

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Section: Comprehensive Assessment Index Of Soil Physiochemical Propertiesmentioning

confidence: 99%

Effects of rubber plantations on soil physicochemical properties on Hainan Island, China

Sun

Lan

et al. 2021

J of Env Quality

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“…However, no site exceeded the critical value 1.80 g/cm 3 for the restriction of monocot root growth in compressed sandy soils (Reichert et al 2009, Wilson et al 2013. Significantly lower DBD in the topsoil and subsoil of woody and grassy plots was caused by increased contents of humus, as documented below, and the positive rhizosphere effect of permanent vegetation on the formation of soil porosity (Yu et al 2018), which is higher than the effect of the low soil texture variability in the park.…”

Section: Resultsmentioning

confidence: 79%

Changes in selected physico-chemical properties of floodplain soils in three different land-use types after flooding

Suchara¹,

Sucharová²,

Holá³

2021

PLANT SOIL ENVIRON

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This article provides information on selected physico-chemical properties, including soil colour, texture, electrical conductivity, pHH2O, pHCaCl2, content of total carbon and Q4/6 quotient, of the topsoil and subsoil of former flood sediments at three diverse vegetation plots in a floodplain and in two reference plots unaffected by floods, and changes of some soil properties caused by a new subsequent flood. Aggradation of flood sediments in the area was controlled both by local terrain morphology and vegetation type cover. Differences in the properties of sediments in the individual plot types were caused by the different production of litter, root biomass and carbon cycling before the new flood. Vertical distributions and inventories of 137Cs in soils revealed the position and proportion of modern sediments in soil profiles, man-made filling of former erosion grooves and ploughing depths. The new flood of a lower hydrological power aggraded a thin layer of organo-clay sediment on the soil surface but showed minor effects on the investigated soil properties. The lowest dry bulk density and highest total porosity values were found in the topsoil of woody and grassy plots after the flood implying no substantial break down of soil aggregates by the flood. The highest dry bulk density values in the subsoil of fields indicated soil compaction from agricultural machinery. No increased soil salinity was found after the flood. The flood did not significantly affect the pHH2O of the topsoil and subsoil; however, a significant increase in pHCaCl2 was found for the topsoil of grassy plots and for all topsoil samples from the park. No significant increases in total carbon (Ctot) contents were found in topsoils of any plot types after the flood in spite of an accumulation of thin organo-clay material on the soil surface after the flood. However, significant increases in Ctot in subsoils of all plot types indicate the vertical migration of colloidal and dissolved organic carbon in soils during the flood. Ctot contents positively correlated with electrical conductivity values and negative correlated with pH values. The relatively minor changes in soil physico-chemical properties found after the flood can be explained by the short duration and small dynamic power of the flood, and the timing of sampling when the flood had receded and soil aeration was already being restored.

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“…Soil texture also shows no influence on soil water-physical properties across various circumstances [4,15,64], and the reason for this may be their low contributions when compared with other factors. Moreover, it is worth noting that there are other drivers affecting soil hydraulic properties crucially, such as root system and earthworm activities [65,66], although we barely mentioned them in this research. As such, soil structure is the consequence of multiple interactions of plant attributes and ecosystem processes, which underscores the necessity of an integrative understanding of biotic and abiotic drivers influencing soil water-physical properties.…”

Section: Discussionmentioning

confidence: 82%

Anthropogenic Disturbances Shape Soil Capillary and Saturated Water Retention Indirectly via Plant Functional Traits and Soil Organic Carbon in Temperate Forests

Liu

Yuan

Ali

et al. 2021

Forests

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Soil’s water-physical properties support essential soil water retention functions for driving water distribution and availability, which is vital for plant growth and biogeochemical cycling. However, the question concerning how tree compositions and their interactions with other abiotic factors modulate soil’s water-physical properties in disturbed forests remains poorly understood. Based on observational data from nine permanent forest sites (18,747 trees and 210 plots) in the northeast of China, where forests once undergone three different levels of anthropogenic logging disturbance, we evaluated how multiple biotic (i.e., tree diversity and functional trait composition) and abiotic (soil texture and soil organic carbon) factors influence water-physical properties (i.e., in terms of soil capillary water retention (WC) and soil saturated water retention (WS)) in temperate forests. We found that the impacts of logging disturbance on soil water-physical properties were associated with improved tree diversity, acquisitive functional traits, and SOC. These associated attributes were also positively related to WC and WS, while there was no significant effect from soil texture. Moreover, disturbance indirectly affected soil water-physical properties mainly by functional traits and SOC, as acquisitive functional traits significantly mediate the effect from disturbance on WC and SOC mediates the influence from disturbance on WS. Finally, our results emphasize the potential relationships of tree composition with SOC and soil water retention as compared with soil texture and hence suggest that plants can actively modulate their abiotic contexts after disturbance, which is meaningful for understanding forest health and resistance.

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Effects of Tree Root Density on Soil Total Porosity and Non-Capillary Porosity Using a Ground-Penetrating Tree Radar Unit in Shanghai, China

Cited by 35 publications

References 25 publications

Effects of rubber plantations on soil physicochemical properties on Hainan Island, China

Effects of rubber plantations on soil physicochemical properties on Hainan Island, China

Changes in selected physico-chemical properties of floodplain soils in three different land-use types after flooding

Anthropogenic Disturbances Shape Soil Capillary and Saturated Water Retention Indirectly via Plant Functional Traits and Soil Organic Carbon in Temperate Forests

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