Contrasting effects of warming and autonomous breeding on single-rice productivity in China

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  • Agriculture, Ecosystems and Environment 149 (2012) 20 29

    Contents lists available at SciVerse ScienceDirect

    Agriculture, Ecosystems and Environment

    jo u r n al hom ep age: www.elsev ier .co

    Contra us produc

    Leilei Liua National Eng or Inf210095, PR Chib CSIRO Sustain berra

    a r t i c l

    Article history:Received 22 SeReceived in re13 December Accepted 14 DAvailable onlin

    Keywords:Climate changRiceGrow ModPotential yieldRainfed yieldRice variety change

    ice pant fo

    willrovene anges inXinyaperatang, b

    to a reduction in the length of rice growing period and a reduction in grain yield at all study sites, if novarietal changes had occurred. However, the adoption of new rice varieties stabilized growing duration,increased harvest index and grain yield at three of the four sites. In the face of future warming, a plannedbreeding effort may be needed to offset the negative impact of future climate change.

    2012 Elsevier B.V. All rights reserved.

    1. Introdu

    The signdocumenteprojected tolast two decrop develoLobell and Aindicated aUnited Stat1998. Pengevery 1 C iChina, annuduring the page global tannual mea0.13 C/decRice is one imately 30%the total gr

    Correspon Correspon

    E-mail add

    0167-8809/$ doi:10.1016/j.ction

    icant warming trend since the 1980s has been welld at most locations around the world, and this trend is

    accelerate in the future (Tao et al., 2006). During thecades, climate changes have been shown to impact onpment and yields (Estrella et al., 2007, Liu et al., 2010;sner, 2003; Menzel et al., 2001). Lobell and Asner (2003)

    signicant decline in maize and soybean yield in thees as a result of increased temperature from 1982 to

    et al. (2004) showed a 10% decline in rice yield withncrease in minimum temperature in the Philippines. Inal average air temperature has increased by 0.50.8 Cast 100 years, which was slightly greater than the aver-emperature rise (Ding et al., 2006). From 1955 to 2000,n maximum and minimum temperatures increased byade and 0.32 C/decade for all of China (Liu et al., 2004).of the main food crops in China, accounting for approx-

    of the total planting acreage of food crops and half ofain production (Jing et al., 2007). Improved knowledge

    ding author. Tel.: +61 2 62465964; fax: +61 2 62465965.ding author.ress: Enli.Wang@csiro.au (E. Wang).

    of how the past climate change has impacted rice production inChina can provide insights into the likely impact of future climatechange, and assist in the development of future climate adaptationstrategies to ensure Chinas food security.

    In China, a few studies have investigated the impact of pastand possible future climate changes on rice production. Tao et al.(2006) studied the impact of climate changes on rice phenologyand yield using correlation analysis with data collected at experi-mental stations from 1981 to 2000. They showed that changes intemperature over past decades had accelerated rice phenologicaldevelopment and decreased rice yields. Yao et al. (2007) assessedthe impact of climate change on irrigated rice yield using the IPCCB2 climate change scenario (IPCC, 2007) and the CERES-Rice modelfor 20712090 in the main rice areas of China. Their results indi-cated that without the direct effect of CO2 on crop production, theB2 climate change scenario would have a negative impact on riceyield at most rice production regions. With the CO2 direct effect,however, rice yield was predicted to increase at all selected sta-tions. Zhang et al. (2010) analyzed the recorded rice yields over theperiod of 19812005 in the main rice production areas of China, andreported that rice yields were positively correlated with solar radi-ation, which primarily drives yield variation. Similar results werealso found by Sheehy et al. (2006), who reinvestigated the datasetof Peng et al. (2004) and pointed out a decrease in solar radiation,instead of increase in temperature, could also explain the reduction

    see front matter 2012 Elsevier B.V. All rights reserved.agee.2011.12.008sting effects of warming and autonomotivity in Chinaa,b, Enli Wangb,, Yan Zhua,, Liang Tanga

    ineering and Technology Center for Information Agriculture, Jiangsu Key Laboratory fnaable Agricultural Flagship, CSIRO Land and Water, GPO Box 1666, Black Mountain, Can

    e i n f o

    ptember 2011vised form2011ecember 2011e 11 January 2012

    eel

    a b s t r a c t

    China is one of the most important rproductivity in China is very importrice production in China has been andeffects of climatic change, variety impinvestigated. In this paper we combiing to investigate the impact of chanproductivity at four sites (Wuchang, signicant increase in minimum temand from heading to maturity at Xinym/locate /agee

    breeding on single-rice

    ormation Agriculture, Nanjing Agricultural University, Nanjing, Jiangsu

    , ACT 2601, Australia

    roduction countries in the world, and maintaining high ricer world food security. While previous studies showed that

    be negatively impacted by global warming, the confoundingment and agronomic managements have not been separately

    analysis of climate and rice growth data with crop model- climate, rice varieties, and agronomic management on riceng, Zhenjiang and Hanyuan) in China. The results showed aure during all rice growth stages at Wuchang and Zhenjiang,ut little change at Hanyuan. Global warming would have led

  • L. Liu et al. / Agriculture, Ecosystems and Environment 149 (2012) 20 29 21

    in yield. Most of these previous studies either used rice yield datafrom many different cultivars together or used a simulation modelwith a single cultivar to analyze the impact of climate trends onrice growth and yield. The effects of changes in climate, variety andagronomic management (i.e. increased irrigation and fertilization,etc.) have not been separated. Recently, Liu et al. (2010) developeda method to combine long-term experimental data and crop mod-eling to investigate and separate the impact of changes in climate,crop varieties and agronomic management on wheat and maizeproduction in China.

    In this study, we employ a method similar to that used by Liuet al. (2010) to investigate the impact of climate change, varietalchange and agronomic management on rice production in China.We focused on the single rice production regions in China, com-bined with simulation modeling, to conduct a parallel analysis ofclimate and rice growth data collected from 1981 to 2009. Ourobjectives are to: (1) determine whether there were signicanttrends in climatic change during the main growth stages of rice forthis period, (2) analyze the impact of climatic variables (temper-ature, precipitation, rainfall intensity and sunshine hours), varietychange and agronomic management on rice growth and grain yieldand (3) discuss the relative contribution of those factors to thechanges in rice yield.

    2. Materials and methods

    2.1. Study sites

    Six rice cropping regions are classied across China, which coversingle and double rice cropping areas (Fig. 1, from China NationalRice Research Institute, 1989). Four sites were selected from themain singleare Wuchanlongjiang prprovince, Zhand HanyuThese locat

    sites, representing three contrasting climatic regions: the northeastChina cool temperate climate, the east China subtropical climate,and the southeast China mid-subtropical climate. Daily weatherdata and rice growth and yield data were recorded at each site. All ofthese data were collected by the National Meteorological Networksof the China Central Meteorological Agency (CMA).

    2.2. Climate and crop data

    Daily weather data for the period of study include maximum,average and minimum temperatures, sunshine hours and precipi-tation. They were recorded at each study site. Rice was planted from1981 to 2009 at the Agrometeorological Experimental Station ofeach site, and was managed according to local practices for controlof weeds and disease. Fertilizers and irrigation were applied accord-ing to local practices. Rice data include cultivars traits, sowing andharvesting dates, dates of growth stages, aboveground biomass,grain yield, and fertilizer and irrigation management. Crop har-vest index (HI) was calculated as the ratio of grain yield to thetotal aboveground biomass. Three rice growth stages were usedin this study, i.e., S1 from sowing to jointing, S2 from jointingto heading, and S3 from heading to maturity.

    Rice cultivars that were grown frequently changed during thestudy period. At each site, the cultivars used in the experimentswere representative of the most widely grown cultivars in eachregion. In total, eleven, twenty, thirteen and nine varieties wereplanted at Wuchang, Xinyang, Zhenjiang and Hanyuan, respec-tively, during the entire studied period.

    2.3. Data analysis

    nds oee mage wt testtify ons i

    ames rice cropping system regions in this study (Fig. 1). Theyg (4454N, 12709E, 194.6 m above sea level) in Hei-ovince, Xinyang (3207N, 11405E, 114.5 m) in Henanenjiang (3211N, 11928E, 27.3 m) in Jiangsu provincean (2921N, 10241E, 795.9 m) in Sichuan province.ions were chosen because they were typical single rice

    Trethe threach stdents to quanvariati

    Fig. 1. Rice cropping regions in China and the four study sites (Province nver time for the mean of each climate variable duringain growth stages (S1, S2 and S3) of rice and the length ofere tested for signicance at the 5% level using the Stu-

    . The Stepwise Multi-Linear Regression (SMLR) was usedthe contributions of temperature and variety changes ton observed g