Water related Ecosystem Service in the paddyupland rotated and irrigated area of Chengdu
plain——case study in Pidu District

REPOTOR : BITIAN ZHANG, Doctor Candidate, IGSNRR,CAS

Criteria of GIAHS——ecosystem servicel ES: benefits people could get from ecosystem,,,,,,,,TARGET
to sustainably obtain ES,,,,,,,,,,METHOD
Trade off, management of ES,

Study Area——Pidu District, Chengdu city
n LOCATION: in the southeast part of Chengdu city, in the central section of Chengdu plain

SICHUANn HISTORY: 2700 years, used to be the capital of the country “SHU”n BASIC CONDITION: 15 villages, total area 437.5KM2, farmland 133.4KM2, nursery stock
66.7KM2, the “vegetable basket of Chengdu ”,also the “water resource of Chengdu ”

CHENGDU

PIDU
valve

Hotbed chives

River system of Pidu

pGeology & Geomorphology
p Geology

p Geomorphology
E2mW
DrainHighland

Unconfined aquifer
ceiling

Confined aquifer

SN

Applicable for both paddy and vegetables
l 3 main type of geomorphology
Ø mesasupper soil layer is reticulate clay, glutenite in

Located between the first and the second
terraces of the proluvial fun of Min Riverthe lower layerØ Fan-shaped plainbiggest ratio upper soil layer isgrey paddy soil, lower layer is silty sandForming its unique soil structureØ Floodplain level terraces1~3m thick Clay or Asian clayin the upper layer

Pattern of paddy-upland rotation in Pidu&&l Rotation,-

Crop-vege-vege-(vege…)-,

l High diversity-,- --

80+ varieties--l High yield——8.1W CNY/a income on&,-,,-,- ,-- ,,- - ---,,-,, --average---- ,- --,---,----,-,-,,

paddy-upland rotation ——supply & regulation&Regulation of underground waterp Water quantitybasically balancep Water qualityfew section has high level of NH4+,NO3-, NO2-3N

l 3N in underground water
mainly comes from agriculture( leaking in the field)
especially in summer-----high rainfall + high fertilization

Characteristic of field leaking inPidul DRASTIC model(Americanseven factor : Depth of water tableNet rechargeAquifer media
Soil mediaTopographyImpact of Vadose Zone and Hydraulic
Conductivity.
-------------Assessment for the characteristic of leaking

month

1

Annual average
8.5
1980~2012

2

34

5

13.5 23.7

46.6

74.0

p Rainfall in summer covers 75%of the annual rainfall
p Pick 2015 as the typical year

6789105.3 225.4 201.6 140.4

101112

Annualrainfalll

38.7

18.1

5.2

901.0

Underground water quality• Kriging interpolationg( ) =  × ìïéùæ öïæöçç ÷÷ = í × ê- çç ÷÷ ú è ø úè øï êë  ûïî 

arcgis10.2 spatial analysis= £ ³ Feb.

Aug.

MayNov.

Seepage amount
Traditional
summer6~9paddy field (100%)
Other seasons10~5wheat/rape (100%)Contemporary
summer6~9 paddy field(50%)+vegetable(50%)
Other seasons10~5 vegetable(100%)

Ø Two questions
p Under traditional model the utilize OR recharge amount of summerpaddy and other season-vegetable?
p Under contemporary model, the utilize OR recharge amount ofsummer-paddy and other season-vegetable?

/

Seepage amount//F///::/

70
A::

A::
1E 2+70FF:=02:

6 7 7 67 5 A 20:
3 0 06/,:0 5:A 0!"# = !"% ×'(/n0

10 0 2=06
0= 00 50
= 0:l60

3 0 06773

6E 30 0
7 A
2 E0:0:

7A: 3 E: 0 : =732=

2 E0A=255 203 00 50l+, , - O 52 2:

.1

Seepage amount

46/

4462
103
=A

Fertilizer of different vegetables
7060

6060605050.

50
40

7440

3530

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

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u46- 4421- 476./.

VEGETABLES

u 7COMPOUND FERTILIZER KG/

90
80
70
60
50
40
30
20
100

455

27
66- 42180
80

4u 7

44- 4.

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