TY - JOUR
T1 - A study of root water uptake of crops indicated by hydrogen and oxygen stable isotopes
T2 - A case in Shanxi Province, China
AU - Wang, Peng
AU - Song, Xianfang
AU - Han, Dongmei
AU - Zhang, Yinghua
AU - Liu, Xin
N1 - Funding Information:
This work was supported by the National Natural Sciences Foundation of China (no. 40671034 ), and Key Program of National Natural Science Foundation of China (no. 40830636 ). The authors give the sincere thanks to Prof. Caitang Liu for his earnest field work.
PY - 2010/3
Y1 - 2010/3
N2 - Mechanisms of crop root water uptake play an important role in agricultural water management. In this study, stable isotopes were used to understand root water uptake patterns for the main crops (summer corn and cotton) in Shanxi Province, China. Precipitation, irrigation water, soil water, groundwater and stem water were sampled for stable isotopes analyses, and supported by hydrological observations. Both direct inference of hydrogen and oxygen isotopes between stem water and the soil water profile, and multiple-source mass balance assessment were applied to estimate the main depths of root water uptake of crops in different growing seasons. The results show that summer corn and cotton have different root water uptake patterns: summer corn mainly uses the shallow soil water from 0 to 20 cm layer (96-99%) in jointing stage and extending to 20-50 cm (58-85%) in flowering stage, then 0-20 cm (69-76%) again in full ripe stage. In contrast, the main depth of root water uptake of cotton gradually increases during the whole growth stage: from 0 to 20 cm (27-49%) in seedling stage, 20-50 cm (79-84%) in bud stage, 50-90 cm (30-92%) in blooming stage and >90 cm (69-92%) in boll open stage.
AB - Mechanisms of crop root water uptake play an important role in agricultural water management. In this study, stable isotopes were used to understand root water uptake patterns for the main crops (summer corn and cotton) in Shanxi Province, China. Precipitation, irrigation water, soil water, groundwater and stem water were sampled for stable isotopes analyses, and supported by hydrological observations. Both direct inference of hydrogen and oxygen isotopes between stem water and the soil water profile, and multiple-source mass balance assessment were applied to estimate the main depths of root water uptake of crops in different growing seasons. The results show that summer corn and cotton have different root water uptake patterns: summer corn mainly uses the shallow soil water from 0 to 20 cm layer (96-99%) in jointing stage and extending to 20-50 cm (58-85%) in flowering stage, then 0-20 cm (69-76%) again in full ripe stage. In contrast, the main depth of root water uptake of cotton gradually increases during the whole growth stage: from 0 to 20 cm (27-49%) in seedling stage, 20-50 cm (79-84%) in bud stage, 50-90 cm (30-92%) in blooming stage and >90 cm (69-92%) in boll open stage.
KW - Cotton
KW - Hydrogen and oxygen stable isotopes
KW - Mixing model
KW - Root water uptake
KW - Summer corn
UR - http://www.scopus.com/inward/record.url?scp=72449159672&partnerID=8YFLogxK
U2 - 10.1016/j.agwat.2009.11.008
DO - 10.1016/j.agwat.2009.11.008
M3 - Article
AN - SCOPUS:72449159672
SN - 0378-3774
VL - 97
SP - 475
EP - 482
JO - Agricultural Water Management
JF - Agricultural Water Management
IS - 3
ER -