Effects of water and fertilizer on non-structural carbon and ecological stoichiometric ratio characteristics of Salsola passerina
[Objective]Water and fertilizer are criticalfactors restricting the growth of plants in the alpine desert ecosystem in the northern foothills of the Qilian Mountains.This study aimed to investigate the effect of water and fer-tilizer on the growth of Salsola passerina,the dominant species in the alpine desert area.[Method]In this study,typi-cal communities of Salsola passerina were selected in the alpine desert area,with three treatments applied:compound fertilizer addition(F),water and compound fertilizer addition(W+F)treatment,and control(CK).Changes of non-structural carbon of roots,stems and leaves of Salsola passerina and the measurement characteristics of ratio of carbon:nitrogen:phosphorus were analyzed.[Result]The results showed that the vegetation cover of the Salsola pas-serina community increased by 52.7%and 432.9%under W+F compared to F and CK,respectively.The total bio-mass per plant increased by 44.5%and 69.7%under F compared to CK and W+F,respectively.There were signifi-cant differences in the addition of starch,nitrogen and phosphorus(P<0.05),while soluble sugar,non-structural carbon,and whole C were not significantly different in the addition of water and fertilizer.The nitrogen:phosphorus ratio was consistently<14 between organs.The relationship between non-structural carbon and carbon:nitrogen:phosphorus measurement ratio showed that soluble sugars in roots and stems,starch in stems and leaves were nega-tively correlated with total plant nitrogen,while soluble sugars in stems,leaves,and starch were positively correlated with total phosphorus in plants.[Conclusion]The growth of Salsola passerina in alpine desert areas is not signifi-cantly enhanced by W+F nitrogen limitation.Salsola passerina is adapted to arid habitats by adjusting the composi-tion and allocation of non-structural carbon through changes in nitrogen and phosphorus content.
Salsola passerinaalpine desert steppenon-structural carbohydratesecological stoichiometric ratio
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