NDLI: Measurement of net ecosystem production and ecosystem respiration in a Zoysia japonica grassland, central Japan, by the chamber method

Content Provider	Springer Nature Link
Author	Dhital, Deepa Muraoka, Hiroyuki Yashiro, Yuichiro Shizu, Yoko Koizumi, Hiroshi
Copyright Year	2010
Abstract	Measuring light, temperature, soil moisture, and growth provides a better understanding of net ecosystem production (NEP), ecosystem respiration (R $_{eco}$), and their response functions. Here, we studied the variations in NEP and R $_{eco}$ in a grassland dominated by a perennial warm-season C$_{4}$ grass, Zoysia japonica. We used the chamber method to measure NEP and R $_{eco}$ from August to September 2007. Biomass and leaf area index (LAI) were also measured to observe their effects on NEP and R $_{eco}$. Diurnal variations in NEP and R $_{eco}$ were predicted well by light intensity (PPFD) and by soil temperature, respectively. Maximum NEP (NEP$_{max}$) values on days of year 221, 233, 247, and 262, were 2.44, 2.55, 3.90, and 4.17 μmol m$^{−2}$ s$^{−1}$, respectively. Throughout the growing period, the apparent quantum yield (α) increased with increasing NEP$_{max}$ that ranged from 0.0154 to 0.0515, and NEP responded to the soil temperature changes by 44% and R $_{eco}$ changes by 48%, and R $_{eco}$ responded from 88 to 94% with the soil temperature diurnally. NEP’s light response and R $_{eco}$’s temperature response were affected by soil water content; more than 27% of the variation in NEP and 67% of the variation in R $_{eco}$ could be explained by this parameter. NEP was strongly correlated with biomass and LAI, but R $_{eco}$ was not, because environmental variables affected R $_{eco}$ more strongly than growth parameters. Using the light response of NEP, the temperature response of R $_{eco}$, and meteorological data, daily NEP and R $_{eco}$ were estimated at 0.67, 0.81, 1.17, and 1.56 g C m$^{−2}$, and at 2.88, 2.50, 3.51, and 3.04 g C m$^{−2}$, respectively, on days of year 221, 233, 247, and 262. The corresponding daily gross primary production (NEP + R $_{eco}$) was 3.5, 3.3, 4.6, and 4.6 g C m$^{−2}$.
Starting Page	483
Ending Page	493
Page Count	11
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	25
Issue Number	2
e-ISSN	14401703
Language	English
Publisher	Springer Japan
Publisher Date	2010-01-13
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Zoysia japonica grassland Chamber method Net ecosystem production Ecosystem respiration Growing period Forestry Behavioural Sciences Evolutionary Biology Zoology Plant Sciences Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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