Variations in N mineralization and herbaceous species diversity due to sites, seasons, and N treatments in a seasonally dry tropical environment of India

Verma, Praveen Kumar; Verma, Preeti; Sagar, R.

doi:10.1016/j.foreco.2013.02.006

Cited by 40 publications

(38 citation statements)

References 64 publications

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“…However, water availability may be a more important control on legume nodulation in TDFs (Gei and Powers, 2015), in which case N 2 fixation rates may change little with nutrient addition. A fertilization study in a TDF in India showed that N pools and mineralization rates increased with added N (Verma et al, 2013); however, both nitrogen cycling (Saynes et al, 2005) and nutrient addition effects on N cycling in another TDF in Mexico depended on season and forest successional status (Solís and Campo, 2004). Last, nitric and nitrous oxide emissions should increase under N deposition, particularly during the wet season (Erickson et al, 2002;Wang et al, 2014), and especially from N-saturated or P-limited forests (Hall and Matson, 1999).…”

Section: Ecosystem Processes: Soil Carbon Dynamicsmentioning

confidence: 99%

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Nutrient addition effects on tropical dry forests: a mini-review from microbial to ecosystem scales

et al. 2015

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Humans have more than doubled inputs of reactive nitrogen globally and greatly accelerated the biogeochemical cycles of phosphorus and metals. However, the impacts of increased element mobility on tropical ecosystems remain poorly quantified, particularly for the vast tropical dry forest biome. Tropical dry forests are characterized by marked seasonality, relatively little precipitation, and high heterogeneity in plant functional diversity and soil chemistry. For these reasons, increased nutrient deposition may affect tropical dry forests differently than wet tropical or temperate forests. Here, we review studies that investigated how nutrient availability affects ecosystem and community processes from the microsite to ecosystem scales in tropical dry forests. The effects of N and P addition on ecosystem carbon cycling and plant and microbial dynamics depend on forest successional stage, soil parent material, and rainfall regime. Responses may depend on whether overall productivity is N-vs. P-limited, although data to test this hypothesis are limited. These results highlight the many important gaps in our understanding of tropical dry forest responses to global change. Large-scale experiments are required to resolve these uncertainties.

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Section: Ecosystem Processes: Soil Carbon Dynamicsmentioning

confidence: 99%

“…Six years of fertilizing an abandoned Erickson et al, 2002;Solís and Campo, 2004;Verma et al, 2013 No empirical data from tropical dry forests is indicated in bold.…”

Section: Figure 1 | Conceptual Model Of How Nitrogen Addition Affectsmentioning

confidence: 99%

Nutrient addition effects on tropical dry forests: a mini-review from microbial to ecosystem scales

et al. 2015

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“…There was no rainfall during the study period. The soil of the study area is alluvial, well drained, pale brown, silty loam and inceptisol (Buol et al 2003), moderately fertile being low in available nitrogen and medium in available phosphorus and potassium and has a neutral to alkaline soil pH (Sagar et al 2008;Verma et al 2013). The area is a part of middle Gangetic plain of India.…”

Section: Study Area and Sitesmentioning

confidence: 99%

Assessment of potential health risks due to heavy metals through vegetable consumption in a tropical area irrigated by treated wastewater

2015

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Consumption of wastewater-irrigated vegetables is a common practice in developing countries including India. The wastewater irrigation gradually raises the contents of heavy metals in soils and vegetables. The consumption of heavy metal-rich vegetables may cause serious risk to the human health. Therefore, quantification of heavy metals in vegetables collected from wastewaterirrigated field is needed as proportion of farmers using wastewater for irrigation is increasing due to scarcity of water. The aim of the present study was to assess the heavy metal accumulation and the potential human health risks associated with consumption of contaminated vegetables irrigated with waste (WWT) and mixed wastewater (MWWT), grown in an agricultural area of Bhagwanpur, near Banaras Hindu University, Varanasi, India. Seven common vegetables growing at two differentially irrigated areas (WWT and MWWT) were considered for the study. At each site, three samples, each from water, soil and different vegetables, were taken. The samples after digestion were analysed for heavy metal contents using atomic absorption spectrophotometer. Heavy metal contents in soils, vegetables, transfer factor (TF) from soil to vegetables, metal pollution index (MPI) and their health risk in form of target hazard quotients (THQs) were calculated. Results showed significantly higher contents of heavy metals in water, soil and vegetable at WWT than MWWT. The TF value of Cd was notably greater in WWT compared to the MWWT. The values of THQ in children and adults were [1 for Pb and Cd in case of all vegetables at both WWT and MWWT. Among the vegetables, MPI was highest for B. vulgaris followed by B. botrytis, B. capitata, R. sativus, B. nigra, A. sativum and S. tuberosum. THQ for both categories were mostly higher for WWT compared at MWWT, suggesting a greater health risk to local residents from vegetable of the former than latter site. The present study suggests regular monitoring of water quality prior to discharge for irrigation uses and also points out to adopt better wastewater management strategies for proper utilization and disposal of wastewater.

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“…Organochloride pesticides are recalcitrant and resistant to biodegradation (Diaz 2004;Dua et al 2002;Chaudhry and Chapalamadugu 1991). Because of indiscriminate and unplanned uses (EI-Bestway et al 2000), long half-life, nondegradable nature, such poisonous chemical are continuously persisting in the soils of certain agroecosystems (You and Liu 2004;Gavrilescu 2005), contributed to loss of soil fertility, acidification, nitrate leaching and weed invasions (Tilman et al 2002;Verma et al 2013). It further enters into the food chain and pollutes the air, ground and surface water (ICAR 1967;Parsek et al 1995;You and Liu 2004;UN/DESA 2008).…”

Section: Pesticide Relevance and Problemmentioning

confidence: 99%

“…Notwithstanding, the green revolution caused many environmental problems such as increased soil fertility loss, soil acidification, nitrate leaching, increased weed species resistance and loss of biodiversity (Tilman et al 2002;Verma et al 2013). The pesticides are a diverse group of inorganic and organic chemicals like herbicides, insecticides, nematicides, fungicides, and soil fumigants.…”

Section: Introductionmentioning

confidence: 99%

Pesticide relevance and their microbial degradation: a-state-of-art

Verma

Jaiswal

Sagar

2014

Rev Environ Sci Biotechnol

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218

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Variations in N mineralization and herbaceous species diversity due to sites, seasons, and N treatments in a seasonally dry tropical environment of India

Cited by 40 publications

References 64 publications

Nutrient addition effects on tropical dry forests: a mini-review from microbial to ecosystem scales

Nutrient addition effects on tropical dry forests: a mini-review from microbial to ecosystem scales

Assessment of potential health risks due to heavy metals through vegetable consumption in a tropical area irrigated by treated wastewater

Pesticide relevance and their microbial degradation: a-state-of-art

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