Localized nutrient supply can facilitate root proliferation and increase nitrogen-use efficiency in compacted soil

Wu, Xiaobin; Li, Hongbo; Rengel, Zed; Whalley, W. R.; Li, Haigang; Zhang, Fusuo; Shen, Jianbo; Jin, Kemo

doi:10.1016/j.still.2021.105198

Cited by 9 publications

(2 citation statements)

References 88 publications

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“…The abundance of soil nutrients will promote plant growth (Vesic et al, 2020; Wu et al, 2022). For instance, soil with 10% gravel content had richer nutrients, better water retention, and lower bulk density, resulting in significantly better plant growth than soil with 50% and 30% gravel content (Table 3 and Figure 2) (Yang et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

Soil gravel content and plant species configuration control vegetation restoration in Qinghai‐Tibet Plateau

You,

Wu,

Han

et al. 2024

Land Degrad Dev

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Soil gravel content strongly affects ecological restoration; however, the response and mechanism of plant traits to soil gravel content under the sensitive and fragile natural environment of Qinghai‐Tibet Plateau remains unclear. Herein, soils with three gravel content (10%, 30%, 50%) in the southeastern Tibetan Plateau were selected, and three plant species (one native plants of Elymus dahuricus (Ed), and two introduced ones of Festuca elata (Fe) and Medicago sativa (Ms)) were used in seven planting patterns with different proportions (Fe, Ed, Ms, Fe + Ed (1:1), Fe + Ms (2:1), Ed + Ms (2:1), Fe + Ed + Ms (2:2:1)). Plant traits, phytochemical properties and soil stoichiometric characteristics were measured to explore the interactive effects of soil gravels and plant species on vegetation restoration. Average plant height, coverage, shoot biomass, and total biomass were most affected by plant species (F = 277–611, p < 0.01), followed by gravel content (F = 90–195, p < 0.01) and their interaction (F = 5–51, p < 0.05); root biomass was most affected by gravel content (F = 130, p < 0.01). Among plant species, shoot and root biomass, total biomass overall decreased in the order of Fe + Ed + Ms>Fe>Fe + Ms>Fe + Ed>Ms>Ms + Ed>Ed. Plant total biomass, shoot biomass, root biomass and shoot/root ratio among different soils overall decreased in the order of low> high> medium gravel contents. All plant species were restricted by soil nitrogen except for Ed and Ed + Ms (N:P > 14). In addition, increasing the gravel content in the soil will increase the soil bulk density and reduce the total soil porosity. The total soil porosity is significantly positively correlated with the average plant height, coverage, aboveground biomass, and total biomass of plants (r = 0.78–0.91, p < 0.05). The total nitrogen content, total phosphorus (TP) content, and N: P in rhizosphere soil were significantly positively correlated with the average plant height, coverage, aboveground biomass, root biomass, and total biomass of plants (r = 0.70–0.97, p < 0.05), but soil N was significantly positively correlated with aboveground biomass and total biomass (r = 0.69, 0.71, p < 0.05), and there was no significant difference in soil TP content between them. The gravel content directly affects plant growth by changing bulk density and total porosity, but the combined effect of soil nutrients and plants affects plant growth. Therefore, optimizing the configuration of soil properties (mainly nitrogen and compactness) and plant species (isecologic niche plants) is an effective strategy for ecological restoration in the Qinghai‐Tibet Plateau.

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Section: Discussionmentioning

confidence: 99%

Soil gravel content and plant species configuration control vegetation restoration in Qinghai‐Tibet Plateau

You,

Wu,

Han

et al. 2024

Land Degrad Dev

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“…Over-compaction of soil may lead to decreases in crop yield and soil biodiversity, ponding water, and increases in runoff and emissions of nitrous oxide (Alaoui et al, 2018;Bussell et al, 2021). It results in increased fuel consuming in tillage, and often in additional water and fertilizer consumption, to make up the yield loss (Aridhee et al, 2020;Obour and Ugarte, 2021;Wu et al, 2022). Compaction of the subsoil is especially a concern, because it is not easily visible and/or recognized, and difficult to remediate.…”

Section: Introductionmentioning

confidence: 99%

Exploring relationships between soil compaction, amelioration and functioning

Yang

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Background:The compaction of subsoils in agriculture is a threat to soil functioning. Measures aimed at the prevention, amelioration, and/or impact alleviation of compacted subsoils have been studied for more than a century, but less in smallholder agriculture. Methods: A meta-analysis was conducted to quantitatively examine the effects of the prevention, amelioration, and impact alleviation measures in mechanized and small-holder agriculture countries, using studies published during 2000~2019/2020. Results: Mean effect sizes of crop yields were large for controlled traffic (+34%) and irrigation (+51%), modest for subsoiling, deep ploughing, and residue return (+10%), and negative for no-tillage (−6%). Mean effect sizes of soil bulk density were small (<10%), suggesting bulk density is not a sensitive 'state' indicator. Mean effect sizes of penetration resistance were relatively large, with large variations. Controlled traffic had a larger effect in small-holder farming than mechanized agriculture. Conclusion: We found no fundamental differences between mechanized and smallholder agriculture in the mean effect sizes of the prevention, amelioration, and impact alleviation measures. Measures that prevent soil compaction are commonly preferred, but amelioration and alleviation are often equally needed and effective, depending on site-specific conditions. A toolbox of soil compaction prevention, amelioration, and alleviation measures is needed, for both mechanized and smallholder agriculture.

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Root growth, root senescence and root system architecture in maize under conservative strip tillage system

Sha,

Liu,

Hao

et al. 2023

Plant Soil

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Localized nutrient supply can facilitate root proliferation and increase nitrogen-use efficiency in compacted soil

Cited by 9 publications

References 88 publications

Soil gravel content and plant species configuration control vegetation restoration in Qinghai‐Tibet Plateau

Soil gravel content and plant species configuration control vegetation restoration in Qinghai‐Tibet Plateau

Exploring relationships between soil compaction, amelioration and functioning

Root growth, root senescence and root system architecture in maize under conservative strip tillage system

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