Responses of photosynthetic characteristics of Leymus chinensis in temperate typical steppe to component factors of simulated grazing

doi:10.11686/cyxb2021267

Abstract

Abstract:

Grazing is a compound stress， including factors such as feeding， trampling， and dung and urine return. In order to clarify the separate impacts on grassland of the components of grazing， this study simulated the process of livestock grazing by mowing， artificial simulated trampling， and artificial manure addition. Using Leymus chinensis as a model plant， the responses of plant height， vegetation cover， dry weight and photosynthetic characteristics of L. chinensis leaves to components of the grazing process were studied. It was found that feeding and treatments containing feeding factors significantly reduced the cover， height and dry weight of L. chinensis， but increased the net photosynthetic rate， transpiration rate， stomatal conductance， and intercellular CO₂ concentration， but reduced the water use efficiency of L. chinensis leaves. L. chinensis plant height was significantly negatively correlated with net photosynthetic rate， stomatal conductance， intercellular CO₂ concentration， and transpiration rate， and significantly positively correlated with water use efficiency. Soil water content， stomatal conductance， intercellular CO₂ concentration and transpiration rate were significantly positively correlated. Relatively speaking， trampling and feces and their interaction have a weaker effect on L. chinensis than herbage consumption. Overall， defoliation through livestock feeding is the main factor affecting the photosynthetic characteristics of L. chinensis in temperate typical steppe.

Key words: Leymus chinensis, grazing decomposition factor, photosynthetic characteristics, interaction

Ze-dong ZHOU, Hui-ling MA, Xu HAN, Yuan-heng LI, Xi-liang LI, Kun-na LI. Responses of photosynthetic characteristics of Leymus chinensis in temperate typical steppe to component factors of simulated grazing[J]. Acta Prataculturae Sinica, 2022, 31(8): 81-89.

Figures/Tables 7

References 30

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处理 Treatment	df	株高Plant height		盖度Coverage		干重Dry weight
处理 Treatment	df	F	P	F	P	F	P
MO	1	97.432	<0.001	16.809	<0.001	25.280	<0.001
TR	1	3.404	0.072	2.670	0.110	0.680	0.410
DU	1	0.603	0.442	0.628	0.433	<0.001	0.960
MO×TR	1	1.298	0.261	0.660	0.422	0.730	0.400
MO×DU	1	0.484	0.491	0.012	0.915	1.170	0.290
TR×DU	1	0.484	0.491	1.096	0.301	1.750	0.190
MO×TR×DU	1	0.484	0.491	2.544	0.119	0.430	0.520

处理 Treatment	df	株高Plant height		盖度Coverage		干重Dry weight
处理 Treatment	df	F	P	F	P	F	P
MO	1	97.432	<0.001	16.809	<0.001	25.280	<0.001
TR	1	3.404	0.072	2.670	0.110	0.680	0.410
DU	1	0.603	0.442	0.628	0.433	<0.001	0.960
MO×TR	1	1.298	0.261	0.660	0.422	0.730	0.400
MO×DU	1	0.484	0.491	0.012	0.915	1.170	0.290
TR×DU	1	0.484	0.491	1.096	0.301	1.750	0.190
MO×TR×DU	1	0.484	0.491	2.544	0.119	0.430	0.520

处理 Treatment	df	净光合速率P_n		气孔导度G_s		胞间CO₂浓度C_i		蒸腾速率T_r		水分利用效率WUE
处理 Treatment	df	F	P	F	P	F	P	F	P	F	P
MO	1	73.118	<0.001	164.890	<0.001	106.606	<0.001	149.025	<0.001	71.929	<0.001
TR	1	0.009	0.926	1.228	0.272	0.240	0.625	0.347	0.558	0.771	0.383
DU	1	0.189	0.665	0.000	0.989	0.463	0.499	0.006	0.938	1.329	0.253
MO×TR	1	4.261	0.043	3.652	0.060	0.145	0.704	1.812	0.183	0.370	0.545
MO×DU	1	1.878	0.175	1.228	0.272	0.037	0.849	1.016	0.317	0.009	0.926
TR×DU	1	0.002	0.969	0.024	0.877	0.459	0.500	0.576	0.451	3.320	0.073
MO×TR×DU	1	0.678	0.413	1.092	0.300	0.831	0.365	0.171	0.680	0.139	0.711

处理 Treatment	df	净光合速率P_n		气孔导度G_s		胞间CO₂浓度C_i		蒸腾速率T_r		水分利用效率WUE
处理 Treatment	df	F	P	F	P	F	P	F	P	F	P
MO	1	73.118	<0.001	164.890	<0.001	106.606	<0.001	149.025	<0.001	71.929	<0.001
TR	1	0.009	0.926	1.228	0.272	0.240	0.625	0.347	0.558	0.771	0.383
DU	1	0.189	0.665	0.000	0.989	0.463	0.499	0.006	0.938	1.329	0.253
MO×TR	1	4.261	0.043	3.652	0.060	0.145	0.704	1.812	0.183	0.370	0.545
MO×DU	1	1.878	0.175	1.228	0.272	0.037	0.849	1.016	0.317	0.009	0.926
TR×DU	1	0.002	0.969	0.024	0.877	0.459	0.500	0.576	0.451	3.320	0.073
MO×TR×DU	1	0.678	0.413	1.092	0.300	0.831	0.365	0.171	0.680	0.139	0.711

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