Responses of soil phosphorus fractions after nitrogen addition in a subtropical forest ecosystem: Insights from decreased Fe and Al oxides and increased plant roots

Fan, Yuexin; Zhong, Xuhua; Lin, Fu‐Cheng; Liu, Chenchung; Yang, Liuming; Wang, Minhuang; Chen, Guangshui; Chen, Yuehmin; Yang, Yusheng

doi:10.1016/j.geoderma.2018.09.028

Cited by 104 publications

(60 citation statements)

References 69 publications

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“…Our turnover rates of soil occluded Pi (mean 0.0065 g g −1 day −1 ) and occluded Po (mean 0.0066 g g −1 day −1 ) are the first estimates for the two soil P pools, to the best of our knowledge. These estimates were consistent with some other studies that found a significant change in Hedley occluded P within years or even seasons of plant growth in the field (Fan et al, ; Zhang et al, ) and suggest that Hedley occluded P is more dynamic than previously thought (i.e., Hedley occluded P is a very stable soil P that is hardly available to plants; Cross & Schlesinger, ; Yang et al, ). Noted that we estimated soil occluded Pi and occluded Po pools based on soil residual P fraction and OPo rather than direct measurements.…”

Section: Discussionsupporting

confidence: 90%

Quantifying Soil Phosphorus Dynamics: A Data Assimilation Approach

Hou

Jiang

et al. 2019

JGR Biogeosciences

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The dynamics of soil phosphorus (P) control its bioavailability. Yet it remains a challenge to quantify soil P dynamics. Here we developed a soil P dynamics (SPD) model. We then assimilated eight data sets of 426‐day changes in Hedley P fractions into the SPD model, to quantify the dynamics of six major P pools in eight soil samples that are representative of a wide type of soils. The performance of our SPD model was better for labile P, secondary mineral P, and occluded P than for nonoccluded organic P (Po) and primary mineral P. All parameters describing soil P dynamics were approximately constrained by the data sets. The average turnover rates were labile P 0.040 g g−1 day−1, nonoccluded Po 0.051 g g−1 day−1, secondary mineral P 0.023 g g−1 day−1, primary mineral P 0.00088 g g−1 day−1, occluded Po 0.0066 g g−1 day−1, and occluded inorganic P 0.0065 g g−1 day−1, in the greenhouse environment studied. Labile P was transferred on average more to nonoccluded Po (transfer coefficient of 0.42) and secondary mineral P (0.38) than to plants (0.20). Soil pH and organic C concentration were the key soil properties regulating the competition for P between plants and soil secondary minerals. The turnover rate of labile P was positively correlated with that of nonoccluded Po and secondary mineral P. The pool size of labile P was most sensitive to its turnover rate. Overall, we suggest data assimilation can contribute significantly to an improved understanding of soil P dynamics.

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Section: Discussionsupporting

confidence: 90%

Quantifying Soil Phosphorus Dynamics: A Data Assimilation Approach

Hou

Jiang

et al. 2019

JGR Biogeosciences

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“…Several studies have shown that in N-limited environments, N addition in the form of fertilizers or via atmospheric deposition can contribute to the depletion of different P fractions and can exacerbate P limitation due to increased phosphatase activity and rhizodeposition [ 35 , 60 , 61 , 62 ]. However, our study showed no effect of N addition on P dynamics or transformation.…”

Section: Discussionmentioning

confidence: 99%

“…Phosphorus dynamics are affected by plant species [ 19 , 34 , 35 , 36 , 37 ]. For instance, legume crops have been found to mobilize more stable P pools than cereals, reflecting divergent P acquisition strategies [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

“…Previous experiments combining the addition of N and P and investigating P dynamics have been focused on forest ecosystems due to increased concerns about atmospheric N depositions and their impact on soil P availability [ 35 , 62 , 67 , 68 ]. In contrast, studies on legume and grass species have been mostly carried out in inert sand or soils but with either N or P addition [ 37 , 40 , 69 , 70 ].…”

Section: Introductionmentioning

confidence: 99%

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Role of Organic Anions and Phosphatase Enzymes in Phosphorus Acquisition in the Rhizospheres of Legumes and Grasses Grown in a Low Phosphorus Pasture Soil

Touhami

McDowell

Condron

2020

Plants

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Rhizosphere processes play a critical role in phosphorus (P) acquisition by plants and microbes, especially under P-limited conditions. Here, we investigated the impacts of nutrient addition and plant species on plant growth, rhizosphere processes, and soil P dynamics. In a glasshouse experiment, blue lupin (Lupinus angustifolius), white clover (Trifolium repens L.), perennial ryegrass (Lolium perenne L.), and wheat (Triticum aestivum L.) were grown in a low-P pasture soil for 8 weeks with and without the single and combined addition of P (33 mg kg−1) and nitrogen (200 mg kg−1). Phosphorus addition increased plant biomass and total P content across plant species, as well as microbial biomass P in white clover and ryegrass. Alkaline phosphatase activity was higher for blue lupin. Legumes showed higher concentrations of organic anions compared to grasses. After P addition, the concentrations of organic anions increased by 11-,10-, 5-, and 2-fold in the rhizospheres of blue lupin, white clover, wheat, and ryegrass, respectively. Despite the differences in their chemical availability (as assessed by P fractionation), moderately labile inorganic P and stable organic P were the most depleted fractions by the four plant species. Inorganic P fractions were depleted similarly between the four plant species, while blue lupin exhibited a strong depletion of stable organic P. Our findings suggest that organic anions were not related to the acquisition of inorganic P for legumes and grasses. At the same time, alkaline phosphatase activity was associated with the mobilization of stable organic P for blue lupin.

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“…Nitrogen and phosphorus are primary limiting elements for wetland ecosystems. The ratio of nitrogen to phosphorus (N:P) has an indirect influence on the distribution and transformation of P-fractions by effecting vegetation communities and densities and microbial species and activity [16,28]. Fan et al [28] indicated that nitrogen and phosphorus collectively restrict the incubation process of terrestrial ecosystems, including wetland, agricultural, forest and pasture organisms, and their interaction stimulates a unified complex formation of ecosystems.…”

Section: Discussionmentioning

confidence: 99%

Change in the Distribution of Phosphorus Fractions in Aggregates under Different Land Uses: A Case in Sanjiang Plain, Northeast China

Cui

Wang

et al. 2019

IJERPH

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Phosphorus in agro-ecosystems has attracted much attention due to its impact on the nutrient supply of plants and the risk of loss of non-point source pollution. This study investigated the fraction distribution and release of phosphorus from soil aggregates structure under different land uses (rice, maize and soybean). The soil aggregates were characterized as large macro-aggregates (L-mac, >1 mm), small macro-aggregates (S-mac, 0.25–1 mm), micro-aggregates (MIC, 0.053–0.25 mm) and silt clay (SC, <0.053 mm) with the wet-sieving method. A sequential chemical extraction scheme was used to separate phosphorus into labile inorganic phosphorus (L-Pi), labile organic phosphorus (L-Po), moderately labile organic phosphorus (Ml-Po), iron-aluminum bound phosphorus (Fe.Al-P), calcium-magnesium bound phosphorus (Ca.Mg-P), humic phosphorus (Hu-P) and residual phosphorus (Re-P). Experimental results indicated that soil aggregates were mainly S-mac and MIC, followed by L-mac and SC, and they accounted for 52.16%, 25.20%, 14.23% and 8.49% in rice fields, 44.21%, 34.61%, 12.88% and 8.30% in maize fields, and 28.87%, 47.63%, 3.52% and 19.99% in soybean fields, respectively. Total nitrogen (TN), soil organic matter (SOM), Fe and Mn in soil aggregate fractions decreased with the reduction in soil aggregate grain-sizes. For phosphorus fractions (P-fractions), Fe.Al-P and Re-P tended to condense in L-mac and S-mac. MIC and SC were the primary carriers of Ca.Mg-P. Adsorption isotherm simulation results demonstrated that L-mac and S-mac have a strong capacity to retain phosphorus. In rice fields, phosphorus bioavailability and utilization rate were high. However, the P-fractions there were easily changed under aerobic-anaerobic conditions. Therefore, the risk of phosphorus loss during drainage should be given considerable attention.

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Responses of soil phosphorus fractions after nitrogen addition in a subtropical forest ecosystem: Insights from decreased Fe and Al oxides and increased plant roots

Cited by 104 publications

References 69 publications

Quantifying Soil Phosphorus Dynamics: A Data Assimilation Approach

Quantifying Soil Phosphorus Dynamics: A Data Assimilation Approach

Role of Organic Anions and Phosphatase Enzymes in Phosphorus Acquisition in the Rhizospheres of Legumes and Grasses Grown in a Low Phosphorus Pasture Soil

Change in the Distribution of Phosphorus Fractions in Aggregates under Different Land Uses: A Case in Sanjiang Plain, Northeast China

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