Research on Soil Microbial Biomass Carbon and Nitrogen in Larch-Betula platylla Mixed Forests of Different Ages

doi:10.13466/j.cnki.lyzygl.2018.04.010

Abstract

Abstract:

To study soil microbial biomass in Larch-Betula platylla mixed forests of different ages,this paper analyzed the content and correlation of soil microbial biomass carbon and nitrogen,soil physicochemical properties and the ratio of soil microbial carbon and nitrogen,aiming to explore the characteristics of soil and soil microorganisms.The results showed that soil organic carbon,total nitrogen,soil microbial biomass and soil microbial entropy gradually decreased with soil depth.All of them represented a trend of decreasing firstly and then increasing as forest ages increased,and soil turned from “fungal type” to “bacteria type”.The ratio of soil organic carbon and total nitrogen in the age of 25 was extremely lower than both of other two ages.In forest floor,soil microbial entropy was greater with the forest age increase,with the higher activities of soil organic carbon,and the instability of soil carbon pool.The correlation analysis showed that there was a significant relationship among soil microbial biomass carbon and nitrogen and soil organic carbon,total nitrogen,the value of pH,microbial entropy.Thus,soil microorganism presented the variation of the soil fertility as a sensitive indicator.

Key words: soil microbial biomass carbon and nitrogen, forest ages, mixed forests, the ratio of microbial carbon and nitrogen, otal nitrogen

CLC Number:

WANG Yunxia, MA Jun. Research on Soil Microbial Biomass Carbon and Nitrogen in Larch-Betula platylla Mixed Forests of Different Ages[J]. FOREST RESOURCES WANAGEMENT, 2018, (4): 55-60.

Figures/Tables 6

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林龄/a	坡向	坡位	坡度/(°)	海拔/m
15	阴坡	中部	26	2179
20	阴坡	中部	22	2250
25	阴坡	中部	24	2220

土层/cm	年龄/a	有机碳SOC/(g/kg)	全氮TN/(g/kg)	土壤碳氮比SOC/TN	含水率	pH
a层 0~10	15	29.861±3.620a	2.686±0.097a	11.134±1.440b	0.314±0.021b	7.043±0.256b
	20	20.580±2.303b	1.805±0.234c	11.528±1.561b	0.370±0.077b	7.339±0.235a
	25	27.676±5.644a	2.150±0.237b	12.867±2.023a	0.456±0.117a	6.797±0.064c
b层 10~20	15	24.159±3.273a	2.174±0.048a	11.121±1.561b	0.270±0.025b	7.264±0.075a
	20	16.616±2.515b	1.296±0.478c	14.206±4.750a	0.328±0.078ab	7.310±0.258a
	25	23.720±1.496a	1.782±0.089b	13.353±1.249a	0.405±0.132a	7.080±0.180b
c层 20~30	15	19.575±2.798b	1.871±0.042a	10.482±1.607c	0.256±0.023b	7.505±0.170a
	20	16.276±2.186c	1.166±0.516b	16.835±7.639a	0.456±0.065a	7.301±0.387b
	25	24.470±3.171a	1.625±0.099a	15.121±2.250b	0.375±0.106a	7.214±0.204b
d层 30~40	15	15.590±2.686b	1.587±0.037a	9.849±1.827b	0.262±0.013b	7.684±0.204a
	20	12.793±2.676c	1.155±0.477b	12.236±3.344b	0.430±0.076a	7.378±0.284b
	25	22.444±3.097a	1.458±0.160a	15.781±4.046a	0.392±0.117a	7.252±0.173b

土层	年龄 /a	微生物量碳氮比 MBC/MBN	微生物碳熵/% MBC/SOC	微生物氮熵/% MBN/TN
a层	15	7.341±0.707a	2.250±0.281b	3.387±0.223b
	20	7.864±0.471a	2.322±0.298b	3.404±0.642b
	25	7.546±0.606a	2.650±0.436a	4.490±0.841a
b层	15	8.901±2.516a	2.356±0.839a	2.899±0.376b
	20	8.651±1.092a	2.027±0.446a	3.197±0.844b
	25	7.214±1.717a	2.247±0.504a	4.245±0.794a
c层	15	8.952±3.250a	2.205±0.605a	2.724±0.763b
	20	9.281±2.107ab	1.509±0.458b	2.726±1.401b
	25	6.502±1.447b	1.415±0.457b	3.309±0.973a
d层	15	10.824±7.714a	1.777±0.539a	1.968±0.590b
	20	8.517±1.384ab	1.271±0.228b	1.841±0.634b
	25	6.100±1.156b	1.137±0.588b	2.609±0.723a

	MBC	MBN	MBC/MBN	SOC	TN	SOC/TN	pH	MBC/SOC	MBN/TN
MBC	1	0.848^**	0.127	0.641^**	0.768^**	-0.302^**	-0.377^**	0.808^**	0.501^**
MBN		1	-0.339^**	0.683^**	0.735^**	-0.226^*	-0.422^**	0.571^**	0.738^**
MBC/MBN			1	-0.163	-0.032	-0.151	0.243^*	0.304^**	-0.466^**
SOC				1	0.665^**	0.143	-0.411^**	0.100	0.339^**
TN					1	-0.590^**	-0.096	0.518^**	0.114
SOC/TN						1	-0.408^**	-0.523^**	0.262^**
pH							1	-0.146	-0.514^**
MBC/SOC								1	0.362^**
MBN/TN									1