Seasonal and spatial root biomass and water use efficiency of four forage legumes in semiarid northwest China

Xu, Bingcheng; Lun, Shan; Li, Fengmin; Jiang, Jun

doi:10.5897/ajb2007.000-2433

Cited by 15 publications

(2 citation statements)

References 14 publications

(27 reference statements)

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“…However, the decrease of the leaf area in the presence of the water deficit was resulted in a reduction of the dry matter accumulation (Martinielli and Da Silva, 2011). Our results showed an increase of the root/shoot ratio as was mentioned by Bingcheng et al (2007) and Slama et al (2008). This indicated that water stress has entailed a severe decrease in the biomass air part than the root biomass.…”

Section: Discussionsupporting

confidence: 63%

Effect of Drought on Growth and Chlorophyll Content in Three Vetch Species

Haffani

2013

IOSR-JAVS

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Plants in the nature are constantly exposed to biotic and abiotic stresses. Among these stresses, the drought is the mainly important factor unfavorable to the growth and the development of plants, and it is considered as a threat in the sustainable agriculture especially in dry regions. The aim of this work is to study the effect of 4 water regimes [100% (control) -80 -60 and 40% of the field capacity (FC)] on the dimensional and weight growth and on the chlorophyll content in three vetch species (Vicia narbonensis, V. sativa and V. villosa). The experiment was carried out under greenhouse in a randomized complete block design with four replicates. The sowing was realized by one pre-germinating seed per pot. The water stress was imposed at the two leaves stage. The parameters were determined after 71 days of drought. Results showed that height, leaf area and dry matter of shoots and roots decreased significantly with the water stress intensities on the three vetch species. However, V. villosa was the most sensitive one at this stage of growth, compared to Narbonne vetch. The biomass reduction was in concomitance with an important decrease in chlorophyll content which reached 44% and 20% respectively for V. villosa and V. narbonensis.

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Section: Discussionsupporting

confidence: 63%

Effect of Drought on Growth and Chlorophyll Content in Three Vetch Species

Haffani

2013

IOSR-JAVS

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“…Dubach and Russelle (1994) compare alfalfa and birdsfoot trefoil and conclude that these two legumes differ in their mechanisms of N contributions to soil, alfalfa transferring more through root decomposition while trefoil transfers more through nodule decomposition, but differences between TA B L E 3 Compiled data extracted from overlapping grazing study (Maughan et al, 2014) showing crude protein differences between alfalfa and sainfoin legumes in 2012 the two legumes were negligible. Although we did not assess root:shoot, a study comparing alfalfa and sainfoin showed that root:shoot biomass was significantly greater in sainfoin than alfalfa (Bingcheng, Shan, Li, & Jiang, 2007).…”

Section: Field Experimentsmentioning

confidence: 99%

Do plant secondary metabolite‐containing forages influence soil processes in pasture systems?

et al. 2020

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Grazed pastures are susceptible to N loss from urine/manure additions, which increases eutrophication, affecting the global N cycle. Plant secondary metabolites (PSM), such as condensed tannins (CT) and terpenes, influence silviculture soil dynamics by generally decreasing N mineralization. We investigated whether cattle-grazed pastures of non-traditional grass and legume forage monoculture strips including CT-containing sainfoin (Onobrychis viciifolia Scop.) and tall fescue (TF) [Schedonorus arundinaceus (Schreb.) Dumort.] influenced soil dynamics compared with traditional grass and legume forage monoculture strips of alfalfa (Medicago sativa L.), without tannins, and TF. Throughout the study, CT in sainfoin averaged 58.9 g kg −1 whereas alfalfa saponins averaged 5.7 g kg −1. We observed greater soil microbial respiration (p = .01) in TF strips than legume strips, indicating greater microbial activity, and between legumes we found greater soil NO 3 (p = .01) in alfalfa than in sainfoin, although aboveground biomass and N differences were negligible. We also conducted a laboratory soil-feces incubation study to determine if feces from cattle foraging diets of legumes with or without CT influenced soil dynamics. Both feces treatments showed lower NO 3 (p < .001) than without feces, suggesting microbial inhibition. Dehydrogenase activity (DHEA) was lower (p = .03) in sainfoin than alfalfa feces, suggesting CT from sainfoin inhibit DHEA. To our knowledge this study is the first considering whether CT-containing sainfoin and saponin-containing alfalfa influence soil dynamics by assessing general differences in soil parameters. More research is needed to determine whether specific PSM mitigate N loss in pasture systems by slowing N mineralization.

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Biomass partition, leaf gas exchange and water relations of alfalfa and milkvetch seedlings in response to soil drying

Xu¹,

Deng²,

Zhang³

et al. 2010

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This study compared physiological and growth responses to water stress of two legume species during the seedling stage. Potted alfalfa (Medicago sativa L. cv. Algonquin) and milkvetch (Astragalus adsurgens Pall. cv. Pengyang earlymaturing vetch) seedlings were grown under well-watered [soil water content (SWC) maintained at 14.92% daily] or water-stressed conditions (drying) for 15 days. Net photosynthetic rate (P N ), transpiration rate (E) and stomatal conductance (g s ) of both species decreased parabolically. When SWC decreased to 7.2% and 10.3%, g s values for alfalfa and milkvetch were significantly different from those of the respective well-watered plants (p<0.05). When SWC decreased to 6.6% for alfalfa and 6.8% for milkvetch, leaf water potentials (ψ L ) were significantly different from those of the well-watered plants (p<0.05). Thus the difference between the SWC thresholds for a nonhydraulic root signal (nHRS) and a hydraulic root signal (HRS) were 0.6% and 3.5% for alfalfa and milkvetch, respectively. Milkvetch had a lower g s than alfalfa for a given SWC (p<0.05). Although alfalfa seedlings had a higher dry mass (DM) and root:shoot ratio (R/S) than milkvetch in both treatments (p<0.05), we concluded that milkvetch seedlings had greater drought tolerance than alfalfa.Additional key words: hydraulic root signal; root:shoot ratio; nonhydraulic root signal; water stress.

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Seasonal and spatial root biomass and water use efficiency of four forage legumes in semiarid northwest China

Cited by 15 publications

References 14 publications

Effect of Drought on Growth and Chlorophyll Content in Three Vetch Species

Effect of Drought on Growth and Chlorophyll Content in Three Vetch Species

Do plant secondary metabolite‐containing forages influence soil processes in pasture systems?

Biomass partition, leaf gas exchange and water relations of alfalfa and milkvetch seedlings in response to soil drying

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