Ontologia

Commune · CHN

Helan

China

BWkArid, desert, cold(81 %)

Species observed

501

Observations

3 009

Area

1 232,2km²

Ecological tissue

Sample of 38 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.

ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).

RègnesAnimalPlanteChampignonBacterie
RelationsPredationParasitismeSymbiosePollinisation
StatutEn dangerVulnérableProtégéeEndémique

Indicateurs du tissu écologique

Tissu écologique de Helan : 23 espèces reliées par 80 interactions GloBI sur 3 types (connectance 10.3%, filtre Serrano α=0.2). 17 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
40
Interactions affichées
80
Connectance
0.103
Patrimoniales
0
Plus dense que (national)0 %(top 100%)

Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).

Species present

501 distinct species · 3 009 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

3 009 obs · 24 cellules
Obs. / cellule
≥ 1 619
554–1 618
8–553
5–7
< 5

Source : GBIF — observations agrégées par hexagones 0.027° × 0.027° (~22km), filtre précision coordonnée < 10 km. Fond carte : OpenFreeMap · © OpenStreetMap.

Climate

Mean T°

8,9°C

Annual rain

225mm

Warmest m°

28,3°C

Coldest m°

-12,3°C

Elevation: 1 326 m on average (min 1 098 m, max 3 289 m)

Bioclimatic detailsExpert
Annual mean temp.
8,9°C
Annual rain
225mm
Warmest month
28,3°C
Coldest month
-12,3°C
Mean alt.
1 326m
Min
1 098m
Max
3 289m
Std. dev.
445m
Köppen-Geiger (dominant)
BWkArid, desert, cold(81 %)Arid

CHELSA BIO 1-19 v2.1 · ETOPO DEM 60s · Köppen-Geiger 1991-2020 (Beck et al. 2018)

Soil & lithology

pH H₂O

8,3

Org. C

14,8g/kg

Clay

23,8%

Sand

32,0%

Silt

44,2%

Average over 0-30 cm. Per-depth details in expert panel.

Dominant lithology: ssGLiMaggregated to Yinchuan

3 soil depths detailedExpert
0–5 cm
pH H₂O
8,2
Org. C
20,1g/kg
Clay
22,6%
Sand
33,3%
Silt
44,1%
5–15 cm
pH H₂O
8,3
Org. C
13,2g/kg
Clay
23,4%
Sand
32,4%
Silt
44,2%
15–30 cm
pH H₂O
8,3
Org. C
10,9g/kg
Clay
25,3%
Sand
30,3%
Silt
44,4%

SoilGrids 250m (ISRIC, 2017) · GLiM v1.0 (Hartmann & Moosdorf 2012)

Land cover

Forest5.3%
Crops35.0%
Built-up1.5%
Bare soil5.2%
Other (grassland, water…)53.0%

Copernicus Global Land Cover 100m (Buchhorn et al. 2020)

Hydrology5 basins · 3 lakes · 9 rivers

Hydrology metrics for this exact territory

Stream length here

157,4km

Lake surface here

0,65km²

Basins crossed

5

Max stream order

7

Max drainage

292 907km²

Discharge in basins

246,2m³/s

Mean precip.

205mm/an

Mean T°

8,1°C

Moisture idx

-0,80

Max snow

5%

Mean runoff

1mm/an

Mean elev. (basins)

1 307m

Watersheds crossing here

Lakes (3, top by area)

Live spatial overlap (cached after first hit) · HydroBASINS lev08 × HydroLAKES × HydroRIVERS v10

Human pressure

Pop. density

2hab/km²

Night light

2,1nW

Built-up

153,5%

Pesticides

62,6kg/km²

GHSL POP/Built 2020 · VIIRS lumière nocturne · PEST-CHEMGRIDS 2020 (Maggi et al.)