grassland soil

ENVO:00005750 ·resolve ·TERRESTRIAL ·EXACT SEEDED

A portion of soil which is found in a grassland. — ENVO

SEEDED workflow status. The source-seeding rules supplied this record; consult its curation history for later attributed changes. This status does not establish human review.

Source attestations

Each upstream vocabulary's own account of this habitat. Assertion counts are per-source units and are not comparable across sources — GOLD counts organisms, BacDive strains, PREGO taxa.

What each upstream vocabulary says about this habitat
Source	Label / path	Assertions	Unit
ENVIRONMENTS_TABLE	soil_grassland Physicochemical parameter bands from kg-microbe's environment table.	—
MADIN	grassland soil	35	TAXON
PREGO	grassland soil	222	TAXON

Broader habitats

soil ENVO:00001998

Environmental parameters

Physicochemical parameters
Parameter	Value	Source
GRADIENTS	high	kg-microbe environments.csv (soil_grassland)
NUTRIENTS	medium	kg-microbe environments.csv (soil_grassland)
ORGANIC_MATTER	medium	kg-microbe environments.csv (soil_grassland)
PH	medium	kg-microbe environments.csv (soil_grassland)
PRESSURE	low	kg-microbe environments.csv (soil_grassland)
SALINITY	low	kg-microbe environments.csv (soil_grassland)
SALINITY_VARIABILITY	small	kg-microbe environments.csv (soil_grassland)
STRUCTURAL_COMPLEXITY	high	kg-microbe environments.csv (soil_grassland)
TEMPERATURE_VARIABILITY	medium	kg-microbe environments.csv (soil_grassland)
WATER_AVAILABILITY	medium	kg-microbe environments.csv (soil_grassland)
WATER_VARIABILITY	occasionally dry	kg-microbe environments.csv (soil_grassland)

Causal graphs

Grassland soil root drought carbon pulses

Grassland soils are structured by dense herbaceous root systems, moderate organic inputs, and recurrent shifts in water availability. Root exudates and root litter feed rhizosphere bacteria, arbuscular mycorrhizal fungi couple roots to nutrient cycling, and drought followed by rewetting redistributes soluble carbon and shifts the bacteria and fungi responsible for decomposition, nitrogen cycling, and extracellular enzyme production.

Directed graph · arrows run from subject to object. Focus or hover over a node or arrow for details; the evidence table follows.

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grassland_soil_root_drought_carbon_pulses edges
Edge	Subject	Predicate	Object	Evidence
`grassland_soil_determined_by_plant_cover`	grassland soil	determined by Grassland vegetation defines the soil context and supplies the belowground plant inputs that feed grassland soil microorganisms.	grassland plant cover	`DOI:10.1007/s10705-009-9314-3` Millard and Singh reviewed links between grassland vegetation, root carbon release, and soil microbial diversity.
`plant_cover_extends_roots`	grassland plant cover	extends Herbaceous grassland plants form dense fine-root systems that create a large rhizosphere interface in soil.	dense fine roots	`DOI:10.1007/s10705-009-9314-3` The grassland vegetation review discusses roots as the main route by which plants affect nearby soil microbial activity.
`fine_roots_release_exudates`	dense fine roots	releases Living grassland roots release soluble carbon compounds into surrounding soil.	root exudates	`PMID:30464767` Karlowsky and colleagues traced recently assimilated carbon into water-extractable organic carbon and microbial biomarkers in mountain grassland soils.
`exudates_select_rhizosphere_bacteria`	root exudates	selects for Root-derived carbon favors bacteria that can exploit fresh rhizodeposits near grassland roots.	rhizosphere bacteria	`DOI:10.3389/fpls.2018.01593` The mountain-grassland pulse-labeling study linked root exudates to bacterial and fungal microbial recovery after drought.
`fine_roots_feed_am_fungi`	dense fine roots	feeds Grassland roots support arbuscular mycorrhizal fungi that exchange fungal-acquired nutrients for plant carbon.	arbuscular mycorrhizal fungi	`DOI:10.1111/1365-2745.13521` Jia and colleagues used experimental grassland microcosms to test how arbuscular mycorrhizal fungi affect drought and nitrogen responses.
`am_fungi_support_nitrogen_cycling`	arbuscular mycorrhizal fungi	contributes to Arbuscular mycorrhizal fungi couple the plant community to soil nitrogen cycling and nitrogen-retention responses.	nitrogen cycling	`DOI:10.1111/1365-2745.13521` Jia and colleagues found that arbuscular mycorrhizal fungi influenced nitrogen cycling and nitrogen losses in experimental grassland communities.
`roots_contribute_litter`	dense fine roots	produces Turnover of fine grassland roots adds belowground litter to the soil organic matter pool.	root litter	`DOI:10.1007/s10705-009-9314-3` Millard and Singh reviewed root inputs as plant controls on microbial activity and composition in grassland soils.
`root_litter_feeds_organic_matter`	root litter	produces Dead root material supplies organic polymers that are retained and decomposed in grassland soil.	soil organic matter	`DOI:10.1007/s10705-009-9314-3` The grassland review discusses plant inputs and litter quality as controls on the belowground microbial community.
`organic_matter_selects_enzyme_producers`	soil organic matter	selects for Organic polymers select for microorganisms able to invest in extracellular enzymes that hydrolyze plant residues.	extracellular enzymes	`DOI:10.1016/j.soilbio.2013.03.034` Alster and colleagues measured grassland soil enzyme activities as microbial responses to drought and nitrogen addition.
`extracellular_enzymes_drive_decomposition`	extracellular enzymes	drives Extracellular enzymes depolymerize root and soil organic matter into substrates that can be assimilated by soil microbes.	polymer decomposition	`DOI:10.1016/j.soilbio.2013.03.034` The grassland enzyme study profiled hydrolytic and oxidative extracellular enzyme responses to changing water and nitrogen supply.
`decomposition_releases_nitrogen`	polymer decomposition	drives Decomposition releases organic nitrogen into microbial and inorganic nitrogen pools.	nitrogen cycling	`PMID:35762785` Wang and colleagues linked drying-rewetting effects in soil communities to changes with potential consequences for nitrogen cycling.
`drought_reduces_soil_water`	grassland soil	varies by Grassland soils can experience water limitation that constrains microbial activity and concentrates soluble root-derived compounds.	intermittent drought	`PMID:30464767` The mountain-grassland study showed accumulation of root exudates during drought.
`drought_selects_resistant_microbes`	intermittent drought	selects for Low water availability favors grassland soil microorganisms that tolerate matric stress and substrate diffusion limits.	drought-resistant microbes	`PMID:35762785` Wang and colleagues experimentally compared chronic precipitation reduction with a drying-rewetting cycle and measured shifts in grassland soil bacteria and fungi.
`drought_accumulates_soluble_carbon`	intermittent drought	produces Drought allows root-derived soluble carbon to accumulate in soil before rapid use after water returns.	soluble carbon pulse	`DOI:10.3389/fpls.2018.01593` Karlowsky and colleagues found drought accumulation of root exudates that supported microbial recovery after rewetting.
`drought_followed_by_rewetting`	intermittent drought	followed by Return of precipitation after grassland soil drought produces a rapid rewetting pulse for the surviving microbial community.	rewetting pulse	`PMID:35762785` Wang and colleagues imposed drought followed by rewetting to measure pulse responses of grassland soil microbial communities.
`rewetting_releases_carbon_pulse`	rewetting pulse	mobilizes Rewetting reconnects soil water films and mobilizes accumulated soluble substrates to surviving microbial cells.	soluble carbon pulse	`PMID:30464767` Pulse-labeling in mountain grassland showed post-drought microbial recovery supported by carbon accumulated during drought.
`rewetting_shifts_nitrogen_cycling`	rewetting pulse	alters A drying-rewetting pulse changes the abundance and activity of microbial nitrogen-cycling guilds in grassland soil.	nitrogen cycling	`DOI:10.1128/msystems.00247-22` Wang and colleagues found that a drying-rewetting cycle shifted grassland soil microbial communities more strongly than reduced precipitation alone.

Associated taxa

Taxa reported from this habitat, which is weaker than being characteristic of it. rank is out of pool: a high rank in a pool of thousands of near-tied scores is a weak claim. Entries corroborated by a second, independent source are listed first.

Taxa reported from this habitat
Taxon	Source	Rank	Pool
Marinoscillum furvescens `NCBITaxon:1026`	PREGO	1	222
Oscillochloris trichoides `NCBITaxon:104176`	PREGO	2	222
Clavaria zollingeri `NCBITaxon:104245`	PREGO	3	222
Nocardioides sp. CF8 `NCBITaxon:110319`	PREGO	4	222
Leifsonia poae `NCBITaxon:110933`	PREGO	5	222
Seinonella peptonophila `NCBITaxon:112248`	PREGO	6	222
uncultured Ralstonia sp. `NCBITaxon:114715`	PREGO	7	222
Amycolatopsis sacchari `NCBITaxon:115433`	PREGO	8	222
Hominimerdicola alba `NCBITaxon:1264`	PREGO	9	222
Ruminococcus flavefaciens `NCBITaxon:1265`	PREGO	10	222
Micrococcus luteus `NCBITaxon:1270`	PREGO	11	222
Isosphaera pallida `NCBITaxon:128`	PREGO	12	222
Staphylococcus epidermidis `NCBITaxon:1282`	PREGO	13	222
Nocardioides sp. C190 `NCBITaxon:134561`	PREGO	14	222
Paenibacillus polymyxa `NCBITaxon:1406`	PREGO	15	222
Bacillus sp. (in: firmicutes) `NCBITaxon:1409`	PREGO	16	222
Paenibacillus larvae `NCBITaxon:1464`	PREGO	17	222
Streptomyces europaeiscabiei `NCBITaxon:146819`	PREGO	18	222
Clostridium `NCBITaxon:1485`	PREGO	19	222
Clostridium longisporum `NCBITaxon:1523`	PREGO	20	222
Pseudonocardia zijingensis `NCBITaxon:153376`	PREGO	21	222
Desulfosporosinus orientis `NCBITaxon:1563`	PREGO	22	222
Desulfofundulus australicus `NCBITaxon:1566`	PREGO	23	222
uncultured Methylobacterium sp. `NCBITaxon:157278`	PREGO	24	222
Leptotrichia wadei `NCBITaxon:157687`	PREGO	25	222

Showing 25 of 50 kept associations.

Also called

grassland soils — PREGO

Curation

What a curator decided about this record, and why. A record built from several source concepts can carry one decision per concept.

ADD_CAUSAL_GRAPH 2026-09-04 · codex
Added a grassland soil root drought carbon pulses graph backed by DOI:10.1007/s10705-009-9314-3, PMID:30464767, DOI:10.3389/fpls.2018.01593, DOI:10.1111/1365-2745.13521, DOI:10.1016/j.soilbio.2013.03.034, PMID:35762785, and DOI:10.1128/msystems.00247-22.

Provenance

Generated by scripts/seed_from_sources.py from the committed inventories in data/raw/. View the record.